SEX ED HOMESCHOOL

For all of our lives, my sister and I were home-schooled by our mom.

We live in a rural area, just me, my mom, and my twin sister Julia. My name's Robert. Not Robert California, not Robert New York, just Robert.

Mom and Dad got divorced so long ago that I can't even remember when it happened, and Dad had gradually faded from our lives. Our parents had split their seemingly vast fortune, which left our mom with more than enough resources to spend the majority of her time being our teacher. She was really into it; she developed lesson plans, decorated the classroom for holidays, gave reading assignments, the whole shebang. She had even found a couple of those combination chair-desks, complete with the little metal basket under the chair.

It's not that there wasn't a public school system that we could have attended, but Mom had gone there when she had grown up, and she didn't want to send us there.

"I don't want you guys to go through what I went through at the schools around here. It's better that I just teach you here at home," was the general explanation. We never pressed Mom for more details, and since the public schools around here looked so run-down and depressing anyway, we felt like we understood.

I was lucky. Rather than go to the crappy schools in this little town, I got to spend my time in the very nice house I grew up in, with my two favorite people in the world: Mom and Julia.

Shortly after my sister and I turned eighteen in the middle of our final year of high school, Mom wanted to introduce a new topic of education.

_____

"Shouldn't we have started learning about this stuff... a while ago?" I asked our teacher from my seated position in my desk. I glanced over at my sister and we exchanged a quick look: I know, right?

"Well," Mom began, "I waited until you two were grown for a few different reasons. One of them is because I wanted you guys to be able to take this stuff seriously. It's important, and I didn't want a couple of pubescent kids snickering about penises and vaginas or anything like that. You're adults now, so I expect that you can behave like adults during these lessons." She sounded serious, but there was an odd hint of playfulness dancing under her voice.

"Only technically adults," I replied.

"Yeah," Julia agreed, "I mean, I don't really feel like an adult."

"You never really do, sweetie," Mom told her.

"Well, maybe after today's lesson --- we will," I said, stretching my arms in front of myself and yawning through my sentence. It was only a few minutes after 9AM. Our mom, who used to joke that we should call her Ms. Mommy during school hours, actually ran a pretty tight home-schooling ship. She wasn't unfair, but she wasn't as easy as someone might hope their mom would be as a teacher.

"Oh, honey," Mom started, "It's not gonna be just a 'today' thing. There's a lot to cover. Where do you two wanna get started?"

My sister and I looked at each other unknowingly. Why was she asking us?

"Mom, uh," I started to say, still looking at my sister and slowly turning towards our mom, "Aren't you the teacher here? We don't really know anything."

"Like, at all," Julia added. I nodded in agreement.

_____

My sister and I were raised without the Internet. We used it in school for learning and research, but Mom didn't let us spend time on the Internet outside of school the way we understand most kids do. Neither of us had a phone either.

As impossible and bizarre as this may sound, my sister and I knew virtually nothing about sex; all I really knew for sure was that it had something to do with the penis, and a vague understanding that the woman's vagina would also be involved. That last part was only a guess, though.

_____

"Then in that case," Mom began, switching to full teacher mode, "Let's start from the beginning. Can anyone tell me the first thing that usually happens during sex?" Mom looked back and forth between my sister and myself.

"Uh... Arousal?" Julia asked slowly.

"That's right! When two people have sex, the first thing that starts that process is the feeling of arousal. It might be felt in one person before the other, but both people involved will feel aroused. Now, can any tell me what that might look like?"

My sister and I glanced at each other unsurely, then looked up at Mom for direction.

"Okay, okay. Let me ask this instead. And remember, we're all adults now, right?"

We nodded back to her, still seated in our all-in-one chair-desks.

Mom took a deep breath, then she clasped her hands together and asked, "Robert, does your penis ever get hard?" Oh, god. This was embarrassing It had gotten hard before. I wasn't sure why, but it definitely had.

"Yeah, sometimes in the morning when I wake up," I replied bashfully.

"Wait, it gets hard?!" My sister blurted out, as if she had just heard the most ridiculous thing in the world.

"Julia, please," Mom brushed Julia's question off and returned her focus to me.

"And does it get bigger when it's hard?" Mom asked plainly. I told her it did.

"Like how much bigger?" Julia interrupted again, raising one eyebrow.

"That's a little different for everyone," Mom explained. "Robert, how much bigger does yours get, since your sister wants to know?"

I sighed. This was still pretty awkward, but I reminded myself again that we were all adults. I explained to my sister: "Kind of a lot bigger. And it sticks up too. And it's harder to pee."

"It sticks up?" Julia asked, and Mom answered:

"That's right. That's why it's called an 'erection,' honey. It actually sticks up, like a tower. Did you know that when people build a tower, you could say they 'erected' it?"

"Huh. An erection," Julia said thoughtfully. "Why does it get bigger though?" she asked. We both looked up at Mom for answers.

"That's for another lesson, sweetheart. Right now we're focusing on the basics. Now, Robert, when your penis gets hard, does anything else happen?" Mom asked sort of clinically.

"Uh, it gets more sensitive, I guess," I said awkwardly.

"Have you ever tried touching it when it gets like that?" Mom asked.

Okay, adult time. Time to be a big adult at school and tell the truth. How could my sister and I ever learn if we weren't honest with our teacher and each other?

"Sometimes I do. It feels good to kinda, like... rub it and massage it," I answered, completely truthfully, feeling somewhat ridiculous.

"Does anything else happen? After you've rubbed it for a little while?" Mom asked.

I genuinely didn't know what she was referring to. I had only ever touched myself for a few seconds in the early morning before getting out of bed. Nothing had ever happened aside from that.

"I mean, I don't think so. But I've only ever done it for, like, 30 seconds or so. Then I get up and it goes back to normal eventually," I told my family truthfully.

Mom looked genuinely surprised. "So nothing's ever come out of it when it's hard like that?"

"Something comes out? What, like pee?" Julia interrupted again.

"No, honey, not like pee," Mom replied.

"Mom, do you mean if I keep rubbing it, something comes out?" I asked incredulously.

"That's right. And it feels really good when that happens, too."

"What does it feel like?" I asked. This may sound ridiculous, but I genuinely did not know.

"It's not something that can be explained. It kinda has to be felt," Mom explained.

Julia huffed and held her hands palms up, saying "I just can't believe it gets bigger and harder. I thought it was just, like... like a hose for peeing out of."

_____

"Robert, would you mind showing your sister?"

I turned to Julia, who didn't look nearly as grossed out as I expected her to be. I turned back to Mom and said, "Mom, I don't actually know how to make it hard. It's just like that when I wake up sometimes."

"Oh," Mom said, then looked away for a moment, thinking. Her eyes lit up then and she looked back over at me. "Well, that's actually even better," she said optimistically. "We're learning about sex, right?" Mom's eyebrows went up questioningly as she looked between her two students. We nodded in agreement. "Okay. So let's learn about sex," Mom said with conviction, pulling a chair away from the wall and placing it about 8 feet in front of both desks, facing forward.

"All boys present, please step up to the front of the class!" Oh Jesus. That's me.

I stood up, gave my sister an awkward glance, and made my way up to the front of the class room. As I sat down in the chair Mom had provided, she stepped around me and settled herself into my desk.

"Robert, go ahead and take your penis out for the class," Mom instructed me.

"I--- should I, I mean, should I take off-" I stammered, and Mom interrupted me: "Yes, I think you should take your pants and underwear completely off."

I sighed, mentally preparing to expose myself to my mom and sister, who had not seen my penis since well before puberty.

I undid my jeans, unbuttoning first and then unzipping. I lifted my butt a couple of inches and pushed my pants and boxers down to my ankles, and left them there. The hard plastic of the chair was cold against my bare ass.

Mom and Julia were both focused on my penis, which was still completely soft. After a moment Mom sort of straightened up in her chair and said, "Why don't you play with it, get it hard for your sister to see?" but it seemed like Mom wanted to see as well.

"I guess I can try," I said, awkwardly flopping my penis forward and backward, left and right. "I've never actually tried to make it hard before," I explained honestly.

"That's okay," Mom encouraged me. "Just try to do whatever feels good. If it feels good, that usually makes it hard."

I tried, but after a minute or so with no progress I was ready to give up. Maybe if not for the awkwardness of this situation, I would have gotten hard. I really don't know. But at least it looked like my sister was enjoying the show; her eyes hadn't left my floppy penis from the moment I had taken my pants off. She didn't seem particularly disgusted.

"Julia, you'd like to see your brother's penis get hard, right?" Mom asked my sister, who continued staring dumbly at my groin but slowly nodded her head in agreement.

"Okay, good. I think you might need to help him out a little bit." Help me out? What the fuck was Mom talking about? How was Julia going to help get my dick hard?

But my sister didn't seem opposed. "Yeah. Okay. Sure," Julia said. Her eyes still didn't move.

"Okay," Mom began. "This might be easier in the living room, actually. Who's in the mood for a short field trip?"

Luckily, since our mom was also our teacher, we didn't even need permission slips.

_____

I sat down in the center of the couch, as I had been instructed by my teacher. I resumed awkwardly playing with myself, and I thought I was starting to see a change.

"Julia, would you like to sit here next to me?" Mom asked my sister, motioning to the empty space next to her on the loveseat that was positioned in front of and to the right of the couch. Both the couch and the loveseat were facing the center of the room.

"Or," Mom continued, "If you'd like to get a closer look, you can sit down on the floor in front of your brother," she suggested.

Julia took the second option, plopping down onto the floor in front of me and settling into an Indian-style seated position. Her face was maybe three or four feet away from my penis. Her neck and back were held straight up so she could get the best possible view.

"Okay, now we can continue," Mom began. "It's time to learn about visual stimulation. Julia, honey, are you ready?" Mom asked her daughter.

"Uh-huh," Julia said dumbly, still looking at my flopping penis, which I continued to play around with.

"Okay. Take off your shirt so your brother can see your breasts," Mom told Julia, who gave me an apprehensive look.

"Seriously?" Julia asked.

"Honey, there's a good chance it'll help make your brother's penis get hard," Mom informed my sister. "And bigger too," she added.

"Oh!" Julia said excitedly. "In that case..." she added as she quickly pulled her shirt and undershirt off over her head, tossing them onto the couch to my right. "Ta-daaa!" she sang, still sitting on the floor in front of me, completely topless now.

_____

Anytime someone sees my sister and me together, it's extremely obvious that we're closely related. We are nearly the exact same height, about 5 feet and eleven inches. We have the same straight brown hair, which Julia usually wore at about shoulder-length. She didn't have bangs; she had always thought they looked childish, even when she was a child.

Julia had a pretty enough face, though I had never really thought about whether or not I found her attractive before. Honestly, her face was just a feminine version of my own, so it had never occurred to me before. She is me, I am her, and we are us, and that's all I ever really thought of it. We're both pretty average in terms of weight. Not super skinny, but not even remotely overweight either. We're white, if that matters to you.

My sister's breasts, which I had only ever seen while covered with loose-fitting clothing before, were almost disproportionate in size to her body. Like I said, we're both of pretty average build and weight... but Julia's breasts were gigantic. Mom instructed her to sort of lean back to give me a better view, which Julia was happy to do.

Her massive breasts reached down to just a few inches above her belly button, but they were still perky, and her pale nipples pointed almost directly forward. Perhaps I shouldn't say "point," because at this time my sister's nipples were not hard, or pointy. But they did face forward. From the tops of her breasts down to her nipples, a sparse scoring of barely-perceivable stretchmarks ran, surely the result of her breasts growing too fast, probably years ago.

_____

I did not realize it, but as I stared ahead at my sister's partially naked body, and as she did the same to me, my penis had quickly reached its zenith, or close to that.

"See?" Mom asked. "I knew visual stimulation would work! Julia, do you see how hard your brother's penis is?" she motioned to my penis with her hands.

"It got so much bigger..." Julia wondered out loud. "But is it really hard too?" she asked.

"Robert," Mom said to me, "Would you mind letting your sister touch it?"

I said I wouldn't mind, and I moved my hand away from myself so my sister could take over. I didn't say how excited I was that my twin sister was about to lay her warm hand on my penis. As her fingers gently wrapped around the base of my shaft, I hoped she couldn't feel through my blood flow how excited I truly was. My penis twitched and throbbed in her gentle grip.

"It's really hard. Like, really hard. It's crazy," Julia said.

"That must mean your brother likes what he sees!" Mom said enthusiastically.

"Really?" Julia looked up at me bashfully.

I shrugged. "I can't seem to look away, so... yeah, I think I do," I admitted.

My sister beamed at me. Then she looked over at Mom, and asked studiously, "Is it gross that I kinda wanna see what it tastes like?"

Mom looked taken aback for just a second, but quickly composed herself. "That's not gross, honey. That's completely natural. It probably won't taste like much though," she warned her daughter.

"I still wanna!" Julia whined. "Can I?" she looked back and forth between me and Mom.

"If it's okay with your brother, you can," Mom told her.

Julia looked up at me expectantly.

I shrugged, still trying to conceal how very excited I was becoming. "I guess," I said uncaringly, "if you really want to."

"I really want to," Julia confessed as she got up onto her knees and scooched closer to me.

"I'm so proud of you two," Mom told us. "I knew you'd be able to treat this material with respect, like adults. Julia, go ahead."

_____

"Okay..." My sister held my penis from the base so that it was sticking straight up. She stuck her tongue out between otherwise closed lips as her face inched towards my penis. Just before she made contact, she twisted her head slightly, and then she quickly ran her slippery tongue up and down the underside of my penis several times, her face still turned at a slight angle, before disconnecting from me and returning to her cross-legged seated position.

"Robert, how did that feel?" Mom asked me.

Some obscure instinct urged me to lie, to say that it hadn't affected me at all, and that it was the same as if she had licked my finger. But this was school, and school was the place for honesty. I was just glad I could learn this stuff with my family; it must have been crazy for kids in public schools, learning this material with their classmates, some of whom they may not even be that close with.

"It actually felt really good," I replied honestly. "It's hard to explain it, though," I added.

"Would you like her to continue?" Mom asked. Julia started nodding while looking back and forth between me and Mom. I nodded, still hoping no one could tell how excited I was for her to resume.

Julia resumed licking up and down on the shaft of my penis. For whatever reason she avoided the tip - which was unfortunate, because I wanted to feel her tongue there.

"Be careful, your brother doesn't have much experience with this and his penis might, uhm... go off, prematurely."

"You mean like about how something comes out of it?" Julia asked.

"That's right," Mom replied.

"What does that even look like? It's really not like pee?" Julia asked, looking over at mom and still holding me upright in her hand.

_____

"It's nothing like pee, sweetheart," Mom replied. "Here," she said, picking up her phone and appearing to do a quick search. "You can just see... here. This is kind of a crude way of doing this, but that's what it looks like."

Mom tossed her phone to me. I held it up in front of me, and Julia got up and sat down next to me on the couch so she could see as well.

The video was taken in portrait mode. It started with a woman smiling and looking into the camera. She was pulling her blonde hair out of her face and tilting her face upward. It looked like she was preparing for something.

"Mom, I think this is the wrong video," I said. "This is just a woman, but I thought..." at this moment in the video, a man's penis moved into view at the bottom of the frame. The man must have been the one filming. He appeared to be stroking his penis at a very fast rate.

"Just wait," Mom told us. "Like I said, it's a little crude, but it shows you what it looks like when a man, uhm... when a man has an orgasm."

In the video, the man seemed to inch closer to the woman's face. He continued to stroke himself. The woman seemed to be closing her eyes extra-tight.

"This guy's penis isn't as big as Robert's..." Julia observed nonchalantly.

"Not everyone has the same size-" Mom started to say, and then Julia interrupted her:

"Whoa! That's what comes out!?" Julia exclaimed.

In the video that was still playing on Mom's phone, the man's penis had begun to spurt out streaks of thick white fluid which mostly stayed where they landed. They pelted the woman's face, covering her cheeks and forehead. She opened her mouth and the man repositioned his penis so the next few spurts went in between her lips. When it appeared that he had no more fluid for her, she closed her mouth and swallowed, showing the camera her bare tongue to prove she had swallowed every drop of whatever had just come out of the man's penis. "I love your cum, baby," she said into the camera before the video ended.

"That's right, babe," Mom confirmed for her. "That happens every time two people have sex."

"Every time?" Julia's eyebrows went up. She had returned her attention to the video, which was now replaying.

"That's right, honey. Every time," Mom replied.

"Wow," Julia smiled widely as she continued to watch the video replay. By this point, the man's penis was raining down white fluid on the woman's face again. Looking closer at the video, she didn't seem particularly thrilled to be having this happen to her. She didn't seem nearly as thrilled as my twin sister did in that moment.

"Okay, let's continue, guys," Mom said, motioning to me to hand her phone back. I began to, but Julia placed her hand on my arm. The video was still playing for the second time, and it was right in the middle of the scene.

"Just... I wanna see..." Julia said absently, most of her brain power bent towards the video that played in my hand. It ended after a few more seconds, the woman swallowing what little had been deposited in her mouth. Julia released my arm and sat against the back cushions of the couch.

"I can't believe that happens every time," my sister said. She spoke awkwardly, seemingly stifling a big grin. She was still seated next to me, and she looked down at my penis longingly.

"Did you want to lick your brother's penis some more, Julia?" Mom asked. "I don't think he'd mind." I told them I wouldn't mind at all.

_____

"And guys, just to be clear," Mom began to explain as Julia got back in position in front of me, "it doesn't have to happen like that every time. I mean, the man finishing over the woman's face like that."

Julia almost looked disappointed to hear that. She looked over at our teacher and asked, "But I thought that happened every time?" she said, almost like she was pouting. She was now on her knees in front of me, partially sitting on her feet.

"It does, but it doesn't always have to be done over the rig's face like that. It can be done in many ways."

"Like how?" Julia asked, grinning absently at my penis. She was casually stroking it up and down at the base while listening to Mom talk.

"Well, directly in the girl's mouth is one option," Mom explained. "Or, sometimes the man can wear something called a 'condom' over his penis, and that would catch the, uhm... semen, or as the woman in the video said, cum."

"Sooo, is it semen or cum?" Julia asked unsurely.

"It's both, honey. Scientifically, it's semen. But in the bedroom, it's okay to call it cum. That's just easier. Also, the word 'cum' can be used in multiple ways. For example, if someone was having an orgasm over your face, you could say that they were 'cumming on your face.' Does that make sense, baby?"

"Mmmm-HM!" Julia replied cheerfully. "My brother's gonna cum on my face," she giggled, looking up at me.

"Do you really want that, honey?" Mom asked. "It's just, some girls think that's gross. It's a little, uhm, invasive, I guess."

"It looked okay in the video. And it's not really gross since I'm just doing it with my brother."

She had a point - we shared everything, even popsicles. It's not like we were strangers or something.

"Well, all right," Mom chuckled. "Julia, did you know that you can actually put your brother's penis in your mouth? Some guys like that."

"You mean, like..." and Julia slyly looked over at Mom from the corner of her eye, "like sucking it?" she whispered.

"Yes, honey, exactly. Sucking on his penis," Mom confirmed.

"Should I... Can I really suck it?" Julia looked between me and our mother, seemingly asking us both for permission.

Mom shrugged. "I want you guys to be as hands-on with your education as you're comfortable with. So I'm going to let you two decide on that. But let me give you both a few facts first."

Mom turned around, and began writing a short list of bullet points on the whiteboard, which she had rolled out into the living room when we had initially embarked on our field trip.

_____

1st - Oral sex feels good for the recipient.

Mom explained: "So, for the recipient - in this case your brother - it feels very, very good. Using your tongue on his penis felt pretty good, but this would be even better."

2nd - Oral sex is fun for both people

Mom explained: "At least, it always was for me. Sorry, I know that's not very scientific, but it's true. I honestly think you'd have fun, as weird as that might sound, Julia. If you didn't mind licking his penis, this is just a bit more involved."

"I really didn't mind," Julia shrugged.

3rd - Oral sex can result in orgasm

"Does that mean, like, he cums? Like in the video?" my sister asked.

"That's right, babe," Mom said, "just like in the video. He doesn't have to do it all over your face, of course,-"

"But he can, right?" Julia interrupted urgently. "He can?" she questioned again.

"Of... of course," Mom said, seeming once again taken aback at her daughter's eagerness. I was surprised too, and pleasantly. As guilty as it made me feel, the idea of cumming on my sister's face like in the video was extremely exciting to me.

"You could also keep his penis in your mouth and just let him finish there. It's less messy," Mom suggested.

"You mean I can drink it?" Julia asked unsurely.

"Course you can," Mom told her. "It's not bad for you. I never minded it, but a lot of girls say they don't like the taste. Did you wanna get started? I think your brother is ready." Mom grinned at me.

My beautiful twin sister got into position in front of me. She straightened up on her knees and scooted forward until she couldn't any more. I opened my legs for her. My penis continued to stick up at me, and I don't even know what my balls were doing.

My sister, still holding my penis at the base in her hand, bent my penis forward, facing her. It wasn't uncomfortable, but being pushed forward while being this hard put a certain kind of pressure on the base of my penis.

Julia began to gently kiss the head of my penis. She started directly over the urethra but moved around, kissing all over the head of my penis.

"Use your tongue more, sweetie," Mom coached her daughter, who began to slip her tongue out with each kiss. I couldn't even believe how good it felt, especially when she did it over my urethra. I could feel my sister's breasts rubbing gently against my thighs as she kissed my penis over and over.

"How is that, Robert?" Mom asked, trying to sound professional, not looking at me but at her daughter.

"It feels really good," I replied shakily, also watching Julia, whose lovely eyes were gently closed as she continued to make out with her brother's penis.

"Honey," Mom began, speaking to Julia, "Do you think you can sort of stroke his penis in your hand while you do that? Nice!" While Mom was speaking, Julia had adjusted her hand around the base of my shaft so she could gently massage up and down, which she did very slowly. Her arm which held me was rested over my thigh, with her elbow pointed away from us.

Finally, after what must have been several wonderful minutes of Julia making out with the head of my penis, she began to carefully work me into her mouth. She breathed through her nose as she slurped the head of my penis behind her lips. I felt her thirsty tongue lapping at the front of my penis, right over my urethra.

_____

Outside of my conscious mind, my right hand searched for my sister's left hand, and I held it tight, but not in the same way as when we were children and we held hands to keep from being separated in crowds. "I love you," I said to her without thought.

Hrmmgn, she groaned an answer as she took me deeper into her lovely face, so strangely similar to my own. Now I could not feel her tongue on my tip, but lengthwise along my shaft, the tip of her tongue maybe at the halfway point, but she still pressed farther. Mom said nothing, but she did cross her legs and relax on the adjacent loveseat, cradling her chin in her left hand as she examined us closely. She had set her phone down on the coffee table in front of her. It was nothing unusual to have her full attention during lessons.

Once Julia had made it about three quarters of the way down my shaft, she began to slowly pull back, dragging her wet lips and tongue along my penis as she went. She came off of me with a sweet little kiss against the tip of my penis, and a single strand of moisture stretched from the tip to her lower lip.

Julia swallowed. "I think something came out." She swallowed again. She didn't seem too grossed out. "Did you cum?" she asked me. I told her I hadn't realized anything had even happened.

"You'll know when you cum, Robert, don't worry," Mom informed me. "Sometimes, Julia, when a man is very excited, some fluid can leak out of his penis before he orgasms. That's normal. The unofficial term for that is 'precum.' Did it bother you?"

Julia shook her head emphatically and looked over at me and then back at Mom, all while still shaking her head. "I mean, it wasn't gross or anything. And I think... I dunno, I'm kinda flattered that Robert's getting that excited over this? I mean from me doing this to him. It's kinda exciting for me too," she explained.

"That's great!" Mom exclaimed happily. "Robert, how about you?"

"I, uh, I'm definitely enjoying myself," I stammered.

"Oh, I was too busy to say this earlier," Julia said sweetly to me, "but I love you too." She smiled as she took me back in her mouth. Now she began to truly suck, and she continued for several minutes, until I began to feel something welling up inside me, and I knew something was going to happen, and I thought I knew what that was.

"I'm... I think I'm gonna..." I said, still watching my sister, who did not pause or slow down at all.

"Julia, if you don't mind a little more, I think you should let your brother cum in your mouth," Mom said, sounding just like what I assumed any school teacher would sound like when giving any basic instruction.

"Mmm-hmmm" Julia hummed as she worked, and it sounded like she would have said "Okay" if her mouth were not full of her brother's penis.

"Julia... Julia... I think..." I struggled to say, and then I began to ejaculate into my sister's mouth.

_____

I know I've said this sort of thing before, but believe-it-or-not, this was the first time I had ever consciously ejaculated. I had a vague suspicion that it may have happened in my sleep once or twice before, but I had no way of being sure.

Julia sort of froze when I started cumming, holding most of the head of my penis in her mouth.

"Stroke his penis while he's cumming, Julia," Mom said. Julia obeyed, bringing her hand repeatedly from the base of my penis up to her lips, and then back again. Her eyes were gently closed. Was she really still enjoying herself?

"Robert, how does it feel?" Mom asked.

"It's... unbelievable..." I struggled to say.

"Julia, use your tongue. It's especially important to stimulate the penis when the man is ejaculating. Keep stroking it too," Mom instructed.

I felt my sister's tongue begin to caress the head of my penis in her mouth. It was still mildly convulsing, so I could only assume that a small amount of semen was still dripping into her mouth, and it must have been in direct contact with her slippery tongue. It felt wonderful and I wished she had been doing that the entire time I was orgasming.

After a few more seconds I was done, and I began to squirm from my sister's tongue on my sensitive penis.

"Julia, take it out of your mouth if he's finished cumming," Mom instructed Julia.

My sister slowly took me out of her mouth, keeping her lips closed tight as she did. Mom could be heard breathing in a sharp gasp when Julia swallowed in a single loud gulp.

"What, was I not supposed to swallow it?" Julia looked over at Mom with uncertainty.

"No, honey, no, that's fine," Mom said reassuringly. "I just thought you'd spit out out. Like I said, most girls don't like it."

Julia sort of shrugged. "It was fine, or I wouldn't have swallowed it. Most people really don't like that?" She seemed skeptical. She opened and closed her mouth a few times, moving her tongue around thoughtfully inside her mouth. She swallowed again. "It's kinda good," she finally admitted.

"This does make cleanup a bit easier," Mom conceded. "Otherwise it can sort of get everywhere."

"Like on my face?" Julia asked hopefully.

"Yes, but also everywhere else, too. Usually when a man cums on a woman's face, they miss at least once. Usually more than once."

"Oh." Julia said plainly. "In the video it didn't really look like that."

"I guess that wasn't a perfect example. I just pulled that one up to show you guys what semen looked like. I think if your brother did that over your face, it wouldn't be as clean as it was in the video. Your brother doesn't have that much, uhm... experience, with, uhm... masturbation," Mom explained awkwardly.

"Oh. Can we see another video then?" Julia asked, but Mom was already fiddling around on her phone. After a moment, she handed Julia the phone, where a video was already playing. Julia hopped back up on the couch, sat down next to me and held the phone up in front of us so we could both see.

_____

This one was different from the first video, but very similar. How many videos like this existed?

It showed a woman kneeled down, but in this video, the camera shook violently.

"Almost ready?" The camera man could be heard asking. "Mmm-hmmm," the woman replied, her face upturned and her mouth closed tightly.

"Here we---go---" the man could be heard stammering as several shots of semen flew cleanly over the woman's head.

"Whoa!" Julia and I both exclaimed, as the next few spurts landed only partially over the woman's face, leaving the rest to fall to the floor and onto the couch behind them. The pale semen stood out clearly against the dark green fabric. What a mess.

"He's kinda getting it everywhere," I noted. Julia agreed.

"This guy's penis isn't as big as Robert's either. I can't believe how far his cum went, though." I wasn't sure why, but I was really proud to keep hearing from my sister about how my penis was bigger than the ones we were seeing in the educational material our mom was finding for us.

"Most men's penises aren't as big as your brother's," Mom explained, glancing over at my penis, her eyes lingering for a few seconds longer than necessary. It had mostly lost its hardness by this point, but it was still larger than normal.

"My brother's a freak of nature," Julia teased, reaching over to play with my softening penis, flopping it forward and backward and left and right. "I liked it better when it was hard."

Mom busted out laughing at that one. "Most women do, sweetheart," she explained.

"I still don't even understand. Like, why does it have to get hard. Why does it get bigger. I mean, technically, it would have been easier to suck it if it stayed soft." Julia asked.

"How about we learn about that tomorrow, or maybe the next day? Depending on how much material we have time to cover tomorrow."

"You mean we're done for today?" Julia whined.

Mom looked at her watch. "Yeah, that's first period. Time to get dressed and get back to the classroom guys," she said, almost with a sigh, as if she too was disappointed to be returning to the mundane task of regular school.

Me, I didn't mind. For some strange reason, I felt completely satisfied. It was a feeling I was looking forward to getting used to, at least as long as sex ed was in session.

_____

The rest of the school day was normal, uneventful. Well, I shouldn't say uneventful, we learned some more about the Sino-Japanese war which was interesting.

Before we carried on with the rest of the school day, though, Mom had some homework to assign for sex ed.

"Just to make things cleaner and easier as we continue with your sexual education, I'd like the two of you to trim the hair around your pubic regions. I, uh..." she glanced at my crotch once more, but by this time I was fully clothed again. "I just hadn't realized how hairy you guys had become over the years..."

Julia admitted that she was pretty fuzzy too, and I wondered how she looked completely naked. Was her vagina as hairy as my penis was? Why was that exciting me? And why was the idea of her vagina being hairless exciting me even more? What was going on here?

Mom gave us specific instructions to use the hair clippers with the "Number 1" guard on them, the shortest one. "Be careful, but with the guard it should be pretty safe," she told us.

I did mine before hopping in the shower that evening. It was surprisingly easy, and my penis looked noticeably bigger afterwards. I had a feeling my sister would feel the same way once she saw it, which I assumed would be tomorrow.

Before Julia showered, I heard her trimming away in the bathroom as well.Good morning, class!" Mom greeted us cheerfully as my twin sister and I stepped into the classroom early the next morning. We set our textbooks down in the little metal baskets under our seats and waited attentively for Mom to get started on the day's lessons.

"I take it everyone had time to do their homework for sex ed last night?" Mom asked. The day before, she had assigned us both the task of trimming the hair from around our genital regions. You know, to make things cleaner and easier to see, for educational purposes.

"I did!" Julia's hand shot up proudly. "It looks really cute," she added, glancing over at me briefly.

"Great! Robert?" Mom turned to me.

"Yep, got it done. Number 1 guard," I reported dutifully.

"Oh," Julia said. "I forgot to put the guard on," she confessed.

"That's okay, honey," Mom reassured her. "You didn't cut yourself did you? It's a really sensitive area." her eyebrows went up a little bit from concern.

"Nope!" Julia exclaimed proudly. "I even got, like, in between? Inside? I dunno how to explain it."

"Oh, you mean in between your outer labia?" Mom asked.

"Uhm... I think so? Maybe?" Julia wasn't sure about the terminology.

"Honey, your outer labia is... maybe it'd be easier just to show you. Do you guys mind another field trip?"

We told our teacher we didn't mind.

_____

"Robert, can you grab a towel from my bathroom and meet us in the living room?" Mom asked me as we made our way out of the classroom. Mom's bathroom is all the way upstairs, but that was where all the biggest, fluffiest, most luxurious towels were kept. The older ones were kept in the other three full-size bathrooms in our relatively large house. But why was I grabbing a towel?

By the time I got to the living room with a large white towel under my arm, Mom and Julia were mid-conversation:

"I guess it'd be easiest," Mom was saying, "If I show you two --- oh, thanks, Robert," she said, noticing me. "Just lay the towel down on the floor. Fold it once, long-ways," she instructed and I obeyed, folding the towel once over its long axis, laying it down flat in a strip on the carpeted floor. But still, what was it for?

"Okay, so like I was saying. I think it'd be easiest if we both look, together, at our vaginas. That way your brother can at least see two separate examples. Most men's penises are essentially the same, except for size," Mom quickly glanced over at my groin and then looked back at Julia. "The same thing isn't quite true about women's vaginas. You guys don't mind seeing a little more of your old mom than usual, right?" We told her that didn't bother us. Why would it? She was our mom, not some strange woman.

"Okay, great. Julia, how about we both just take all of our clothes off?" Mom suggested.

"That does seem easier," Julia agreed, and she began to pull her shirt off over her head. She wasn't wearing a bra, and her enormous breasts made a slapping noise when they fell back down to her torso. For a moment they partially flattened against her before they regained their full shape, her pink nipples facing almost perfectly forward.

Mom pulled her shirt off as well, but despite her having slightly smaller breasts than Julia, she was wearing a bra. She did like to keep it professional - she was our teacher, after all.

My penis was already hard as I watched my mom and sister undress. I looked between the two of them, and although my sister was clearly more attractive to me, Mom was still extremely attractive as well. While her breasts were not quite as large as her daughters, her hips and ass were a bit more pronounced. None of us were heavy or overweight, but Mom was the largest.

"Oh wow, you really didn't use the guard did you," Mom remarked, looking down at her daughter's bare vagina once they were both fully naked.

"I know, I know, I forgot! But it's okay, right?" Julia looked down at herself, and used her fingers to pull up on her outer labia, exposing more of the bare slit of her shaved vagina. If I wasn't fully hard yet, seeing this completed the job.

"Honey, it looks great. The only reason I said to use the guard was just so you wouldn't risk cutting yourself. It's actually better that you didn't use it. Robert, what do you think?" My mom and sister both looked over at me.

I felt a little awkward, fully clothed, standing in the living room with my mom and sister who were now both completely naked.

"It looks really nice, like really smooth," I said. I looked from Julia's over to Mom's vagina.

"But yours is really nice too, Mom," I told my mother. She beamed at me. Her vagina, at least while they were both standing up straight, looked just like Julia's, except with a little more hair. I would have guessed that Mom had given herself the "Number 1 guard" treatment last night as well.

"Okay, okay, let's get back on track here. Remember, we're at school right now," Mom said, rolling her eyes a little, but obviously still in very good spirits.

"Julia," Mom continued, "go ahead and sit down on that end of the towel, facing me," Mom instructed my sister, motioning with her hand to the end of the towel that was closer to Julia. "Sit down just like me," Mom said, settling down into a seated position at one end of the long towel, spreading her legs open evenly at about a 90 degree angle. Her legs were open pretty wide, but her vagina still appeared as only a clean slit of flesh underneath a short feathering of dark hair.

Julia sat down the same way a moment later, facing Mom. Her vagina looked the same as Mom's, but with no visible hair at all. At this point Mom leaned back a little, spreading her legs open only slightly father, bracing herself with her right arm against the floor behind her. Julia did roughly the same thing, though I'm not sure she was able to open her legs as wide as Mom could. I sat down next to them in a cross-legged position and watched them both closely. To my left was my sister, and to my right was my mother. With the way they were sitting with their legs splayed out in front of themselves, their feet were only a few inches away from touching each other. If Julia had opened her legs just a little bit wider, they probably would have touched at the toes.

_____

"Robert, you pay attention, too. This is just as important for you to know," Mom told me. I was still in a cross-legged position, sitting on the floor with Mom and Julia in front of me, Julia on the left and Mom on the right.

"Yes, Mom," I acknowledged her, straightening my back and observing closely.

"You can see, right?" Mom checked.

I looked between Mom and Julia. I had a perfect view of each of their naked bodies, including their vaginas. Due to the way they were positioned, Julia's massive breasts seemed to fall off of her chest and rest partially on her sides, her nipples still pointing mostly forward. On the other side, Mom's smaller breasts were doing their own smaller version of the same thing. Similarly, Mom's tummy pudged out a little bit around and beneath her belly button. But on Julia, only a much smaller version of the same thing could be observed.

While still steadying herself against the floor behind her with her left hand, Mom used her right hand to gesture to her outer labia, running her fingertips lightly over the skin.

"This is called the outer labia, guys. It's basically the outer part of the woman's vagina." on the other side of the towel, Julia watched closely, while mimicking mom's hand motions over her perfectly bare outer labia.

"Julia, would you like to show the class what you meant earlier? About how you even trimmed, I think, 'in between' is what you said?" Mom suggested to Julia, but it was more of a teacher's instruction than a suggestion.

"Oh, yeah!" Julia, still leaning back with her left hand, used the fingers of her right hand to sort of pull her outer labia up and out, exposing the pink folds of what I would learn later were here inner labia and clitoris.

"I think I did a pretty good job," Julia said proudly, and she spread her legs open a few inches farther. I gazed longingly at her clitoris.

"You really did, sweetheart," Mom said, leaning forward now to get a closer look at her daughter's bare vagina. "It's really hard to get in between like that," she remarked.

"I know!" Julia agreed. "It took forever but I got it!" She was still holding her vagina open, and she was now looking down proudly at her work.

"Robert, would you like to get a closer look? This is your first time seeing a vagina, and fair's fair: your sister got to get a pretty good look at your penis yesterday."

"I got more than a look," Julia mentioned. The day before, for our first day of sex ed, Julia had put my penis in her mouth and sucked on it until I had an orgasm in her mouth. It was probably the best thing that had ever happened to me, up until that point at least.

"I wouldn't mind getting more than a look," I said, truthfully. But it was almost a lie, because it's not that I wouldn't mind, but more like I was desperate for it. I had never wanted to lay my hands and mouth upon anything like I did in that moment.

"Julia? Would that bother you, if your brother got to, uhm, 'inspect' you? Just kinda like you did with him yesterday, with his penis?" Mom asked my sister. She was still holding herself open, but now she released herself from her grip, her outer labia springing back into position, turning her vagina into just a slit again.

"Sure!" Julia replied enthusiastically. "I mean, I guess it wouldn't really be fair if he didn't. You know, for his education about the female anatomy and all," she said, still excited, but seemingly trying to calm herself down since we were currently in class.

_____

"Great!" Mom exclaimed as she started to stand up.

"Julia, honey, get on the couch. Put the towel down under you, too," Mom instructed my sister.

Julia began to stand up, snatching the towel up from the floor as she did.

"What's the towel for, anyway?" Julia asked as she laid it down in the center of the couch.

"Just a precaution, babe," Mom explained.

"For what, though?" I asked. I had a pretty good idea, and I hoped that I was correct. I was happy with Mom's response:

"Well, sometimes women's vaginas get a little wet when they're excited. It's like the penis getting hard, but it's what happens to the woman.

"So... if the penis gets hard, and the vagina gets wet..." Julia said, looking at Mom questioningly as she settled down on the couch and opened her legs for me.

"That's for another lesson, sweetheart. But the main reason I put the towel down was just in case anything were to happen that would give either of us an orgasm. I mean you or me, Julia," Mom said.

I had been settling into a cross-legged position on the floor directly in front of the couch in between my sister's legs, but when I heard Mom say this, I had to turn around and look up at her.

"Sometimes, at least for me and some other women, when we orgasm, it can make a little bit of a mess," Mom explained.

"Like... like when Robert orgasms? That stuff comes out?" Julia asked. The day before, I had had my first conscious orgasm. And, as I assumed was normal for home-schooled kids, it happened in my sister's mouth.

"No, it's nothing like that at all. If it does happen, it's more like hot water," Mom explained.

"Ohhh, so that's like pee?" Julia asked. I was glad she was taking care of the questions, because I'm not sure if I could have spoken in that moment. I adjusted my pants, which my erection was seemingly trying to escape from. My penis must have been hard, or hardening, starting from the time Mom and Julia got fully undressed. I was still in a cross-legged position on the floor in front of my sister, but I was turned around to face Mom, who was standing naked in the living room in front of us. My right arm was resting on my sister's right thigh.

"It's not quite like pee -- Robert, if it's hard again, go ahead and take your pants off," Mom said, interrupting herself.

"But it's a lot more like pee than your brother's semen is," Mom explained as I quickly unbuttoned, unzipped, yanked my pants and boxers off, and re-assumed my position on the carpet in front of my sister. Now I looked forward at her bare vagina and observed visible moisture creeping out from the dark slit in the center.

"Julia, would you mind if your brother licked your vagina?" Mom asked my sister, who shook her head slowly while looking down at me with a serious and dreamlike expression on her face.

I leaned forward and slowly dragged my thirsty tongue from the bottom of my sister's vagina to the top.

_____

Julia's body seemed to shudder as my tongue reached the halfway point. As my tongue reached the top of the slit of her vagina, she whimpered faintly as I disconnected from her.

She tasted salty, and a little like lemons. It's hard to describe. Also, although there was no visible hair on her, my sensitive tongue could clearly detect short hairs on either side of the interior of her outer labia.

"Robert, I think your sister enjoyed that. Julia?" Mom asked.

Julia just nodded, still looking down at me, waiting for me to begin licking her again.

I licked again, the same as before, but pressed my tongue harder and farther in between her outer labia. I licked several times, from the bottom to the top. Near the bottom, it seemed there must have been an opening, because my tongue could press farther into her at that point, and the taste changed slightly, becoming more lemonesque on the inside.

"Try focusing on the top, Robert," Mom suggested to me. Julia responded by holding her outer labia open at the top, exposing her clitoris. I started to lick it up and down, flicking it with my tongue, but it seemed like too much for my sister. She squealed and squirmed, shutting her legs tight.

"Robert, go AROUND it, around it," Mom explained. Julia opened her legs for me again and spread herself open at the top once more. Now, rather than licking directly over her clit, I ran my tongue in circles around it. On the left and right I could still feel the prickly hairs on the inner part of her outer labia.

"You can go over it some, just do that very lightly, okay?" Mom instructed from behind me. "It's just that part of your sister's body is very very sensitive. It's like the tip of your penis, but actually a lot more sensitive than that."

As I continued to gobble down on my twin sister's delicious crotch, I heard what Mom was saying and quickly understood why Julia was reacting the way she did when I was roughly flicking my tongue against her clit. "Mmmm-hm," I acknowledged her, not taking my mouth away.

"It felt good, but just, like... too good... I guess," Julia said softly to Mom, her speech broken up and awkward. Although she sounded partially incapacitated, it also sounded like something wonderful was happening to her.

"Yeah, that's about what I meant," Mom confirmed. "He can go over it, he just needs to do it lightly."

"Will you?" Julia asked me in a small voice. I answered her by beginning to lightly run my tongue up and down her clit once or twice after swirling. So it would go something like this: Swirl, Swirl, Swirl, light lick, swirl, swirl, swirl, swirl, light lick directly over her clit again.

I continued and my sister put her hand on my head, her fingers caressing my short hair. I hooked my hands around her upper thighs and held her tight against my mouth. I looked up at her briefly while devouring her; she was still looking down at me, with some combination of love and amazement dancing in her dazed eyes. I closed my eyes and focused on the task at hand. Swirl, swirl, swirl, swirl, gentle slow lick.

_____

After several dozen cycles of swirl-swirl-swirl-lick, my sister's body began to respond in a way that was entirely new to me. Her legs seemed to tremble, and her breaths became raspy and labored. She had now ceased holding herself open at the top, and now clenched the couch cushions tight in both of her hands as she stared down at me in amazement.

"Mom... Mom.... Robert..." Julia tried to tell us that something was coming, but she couldn't find the words.

"It's okay, baby, you're just about to have an orgasm, that's all," Mom reassured her sweetly. I continued to lick. "Just relax, honey," Mom instructed my sister.

Julia let out a deep breath, then breathed in sharply, then had what I must assume was her very first orgasm.

Her legs partially closed around my head. Luckily not too tightly. At around the same time, a gush of hot fluid escaped my sister's vagina, splashing against my chin, and, luckily for me, partially up over my lips. My sister let out a loud guttural grunt, which would probably not normally be considered "Sexy".

Instinctively I tasted my lips, then immediately dove back down for more. Seeing my sister's vagina completely soaked, I once again licked her from the bottom of her delicious slit to the top. She tasted slightly different now, more salty maybe, and even more delicious than before. I had a feeling her clit would be very sensitive, so I avoided that area.

I wish I had known exactly where and when the fluid was going to ensue from. If I had known, I would have tried to reposition my mouth a little lower, and open up to catch her fluid in my mouth. From the small taste I got on my lips, I wished there was more. There had been, certainly, but it had mostly dripped down onto the towel.

Since I felt it spray against my chin, it must have come out around the center of her vagina. I would keep that information in mind for next time...

_____

"How was that, sweetheart?" Mom asked my sister sweetly. Julia, who sat naked on a towel that was partially soaked underneath her, leaned back on the couch and stared dreamily at the ceiling. I wanted to put my mouth on her again, but her body was still trembling, and I was sure her vagina, especially her clit, were still very sensitive.

"It was... It was..." She didn't know what to say.

"Love you, Jules," I said, grinning up at her. I was still seated on the floor in front of her crotch.

"Love you... too..." Julia said in a voice that sounded like it came from some wonderful euphoric dream.

"Can I... Can I suck it again? Please?" Julia asked me.

"You're going to need to, actually," Mom replied before I could, and then she went on to explain:

"Your brother's penis has been hard this whole time. If you don't make him cum, there can actually be a buildup of semen in his testicles. It can actually hurt," she said.

"Yeah I think I'm starting to feel that..." I said, noticing for the first time that my testicles felt extremely sore. It may have been like that for some time, I just didn't notice while I was distracted by my sister's body.

"Okay, okay guys, switch," Mom said, almost a little urgently, while making a radial "Switcheroo" motion with her hands.

"Yessss..." Julia said under her breath as she stood up from the couch. At the same time I settled down on the couch in the same spot she had been sitting in. I was extremely happy that she seemed to be as happy about this as I was, maybe even a little more.

The towel was wet under my ass. It didn't bother me. I wanted to snatch it up and wring out the liquid over my mouth, but I didn't do that.

My sister got into position on her knees in front of the couch. I was pantsless, but still had my shirt on. I decided to take it off so things would be even; we were now all, including our teacher, completely naked. I glanced at my mother's naked body briefly before focusing my attention on Julia.

"Good, Robert, good. We might as well all be completely naked. Less risk of making a mess on any of our clothes that way," Mom said. She was now walking over to the couch that Julia was sitting on. Mom sat down next to me, about a foot to my right. She crossed her legs at the knees."Don't' mind me, guys, just want to get a better view of the lesson-in-progress, here," Mom explained nonchalantly. I briefly glanced over at Mom's crotch. The slit of her vagina was fully hidden between her crossed legs. The length and color of her pubic hair looked almost identical to mine.

Julia settled down and got a good look at my penis, taking it in her hand, holding it up and turning it at different angles to see it from all directions.

"It looks bigger now," Julia remarked about my short pubic hair.

"Yeah, it really does," Mom said, her attention fully on my penis which my sister still held at the base.

"Why don't you get started by licking your brother's balls?" Mom suggested to Julia, who leaned forward and dragged her tongue slowly up over my scrotum, starting from about the midway point.

"Honey, try to stroke his penis at the same time," Mom suggested. Julia began to awkwardly stroke at the base of my penis with her hand while she continued licking my balls.

"You can suck them, too, Julia. Just be gentle. Extra credit if you can fit both of them in your mouth," Mom said, partially joking.

"Oooo, extra credit," Julia said quickly before putting her mouth over my left testicle and applying just enough suction to pull it into her mouth. I felt her tongue swirling and sworling over my scrotum. A moment later Julia applied a little more suction power, slurping my right testicle into her mouth as well.

Julia almost sort of choked, sending spit wildly bubbling over my scrotum and partially on the base of my penis, but she kept my balls in her mouth. She looked up at me, her mouth stuffed, her eyes puffy and red and a little wet, her face partially obscured by my throbbing penis which she held up and continued to stroke gently.

"Is that good, Robert?" Mom asked, but I had no words.

"Do you like the way your sister sucks on your testicles?" Mom asked again. This time I could find one word, but only one: "Yeah..."

After a few more seconds Julia released my balls from her mouth with a slight gasp for air.

"Can I suck it now?" She asked Mom. "Your penis?" she said, turning to me.

"I don't think Robert would mind. If you want, you can call his penis his dick, or his cock. It's just a little easier and quicker to say, but anything is fine," Mom suggested.

Julia looked at me with a big shit-eating grin on her face. "Can I suck your COCK?" she asked. I smiled and nodded back at her. Mom leaned closer to me as Julia began.

_______

The day before, Julia had spent maybe a minute or two just gently kissing and slurping at the tip of my penis before she started sucking. This time, she only kissed the tip enough to moisten it so she could get started sucking almost immediately.

I let out an involuntary sigh of relieve once my penis finally entered my sister's mouth.

"See, Julia, that's how good it feels for him. And he really needs to release, too. Just do what you did yesterday. And if you can fit his whole penis in your mouth, the whole thing... that's extra credit too," Mom said.

Julia took me out of her mouth for just a moment and straightened back up in front of me. She looked at my penis for just a moment, as if she was sizing it up for the full suck. "Okay..." she said thoughtfully to herself, leaning forward once more and putting me back in her warm mouth.

After a few trips up and down the shaft of my penis, Julia had worked her way down to the point that there was virtually none of my penis visible outside of her mouth.

"Try and hold it in your mouth like that for just a minute," Mom told Julia. "Guys like it when their penis is partially down a pretty girl's throat like this." Mom shifted her position, briefly uncrossing her legs and recrossing them with the opposite leg on top. For a brief moment I could look over and see Mom's nearly hairless vagina. Was it moist? It looks like it might have been.

Julia began gagging, I could feel it on the forward half of my penis and it felt pretty good. Finally she came off of me, gasping for air, moisture bursting from her mouth where she disconnected at the tip of my penis.

"Julia, do you like sucking your brother's cock?" Mom asked sweetly.

"I love it," Julia replied, and she was sliding her right hand gently up and down my slippery penis.

"I like the way you're stroking his cock, honey," Mom complimented my sister's technique. "Just keep going like that until you've caught your breath," she told Julia.

"Are you almost ready to cum?" Julia asked me while continuing to stroke.

"I think so..." I said. "Can you do that faster?" I asked hopefully.

"Yeah..." Julia said excitedly, focusing her gaze on my penis, smiling curiously as she gradually increased the pace.

"Go all the way over the tip of his penis, honey," Mom told Julia, who had mostly only been stroking the shaft. Now she began stroking over the whole hog, and the sensation became much better.

"Good. That's the most sensitive part of the penis. It feels really good for your brother." She wasn't lying. It felt amazing.

"Try and do a little twisting motion over the... yes, perfect!" While Mom was speaking, Julia had begun to twist and turn her slippery fingers over the head of my penis each time she reached it. She gave it a light squeeze each time as well. It was amazing.

"Julia, when your brother's ready, have you thought about where you want to make him cum?" Mom asked. When she had initially sat down on the couch next to me, she was about a foot away. But I realized that over time she had inched her way close enough to me so that our legs were touching. Her neck was craned towards me, her gaze focused forward. She seemed eager to get a better view of her kids' educational activities.

"Uhm, can he cum on my face?" Julia replied hopefully, like she was asking for some extravagant gift, but almost not expecting to receive it. As she spoke, Mom's legs slowly uncrossed, and they were now open with around 2 feet between her knees. I glanced over and could clearly see the slit of her vagina.

"You really want your brother to cum on your face, honey?" Mom asked, and the middle and ring fingers of her right hand slowly dug into the upper part of her outer labia, and she began to rub herself there in slow circles.

Julia nodded her head vigorously, glancing down at Mom's crotch questioningly, then up at me, then up at Mom.

"Sorry, it's just all the, uh... visual stimulation, I guess" Mom explained, beginning to rub herself faster, and her vagina was moist enough now that the motions of her fingers over her clit were clearly audible. "You can do this too, honey, when you get excited, if you need to orgasm," Mom explained to my sister.

"Oh! Cool! So, like, I can do that when Robert isn't around?" Julia asked. She continued to stroke me at a slowly increasing pace. Her hand ran up and down the shaft and head of my penis, and she still twisted her slippery fingers over the tip each time she reached it.

"Yes, honey," Mom said, clearly breathing harder now that she was rubbing herself. "And Robert, same for you. You can basically do what you're sister's doing right now, just on your own," she explained.

"I think..." I struggled to speak. It felt too good, I must have been getting close. "I think I'd... even if Julia wasn't around I think I'd rather wait until we could be together again," I said while watching my sister's diligent work. She smiled up at me lovingly.

"Yeah, I think so too," Julia agreed, looking over at Mom. "I mean, I think I could wait. Doing this kind of thing alone doesn't sound like that much fun.

"You guys are cute," Mom said patronizingly. "Robert, honey, are you closer?" Mom asked, placing her left hand over my thigh and still rubbing herself. "I think so, yeah," I told her.

"Okay, good," Mom replied, still rubbing herself, vigorously now. "Stand up in front of your sister. If she really wants you to cum on her face, you'll need to be standing over her for that."

I obeyed my teacher, standing up in front of my sister, who backed up a foot or two to make room for me. Once I was standing, Mom snatched the towel out from where I had been sitting, quickly stuffed it under herself, and resumed rubbing her clit. Mom's breasts, which were decent in size even if they weren't as large as Julia's, were trembling and jiggling from the motion.

"Can I suck it until you're ready?" Julia asked me hopefully, staring ahead at my throbbing twitching erection.

"Yes, honey, that's perfect," Mom answered for me, and her voice was a desperate whisper now, almost difficult to hear over the sound of her fingers moistly schlicking over and around her clitoris.

For a moment I wondered, what did Mom's vagina taste like? Did it have all the same textures and nuances as my sister's did? And as I considered this, Julia took me back into her mouth: me standing, Julia kneeling down in front of me, and Mom busily masturbating on the couch behind me to my right, with the towel safely tucked underneath her to catch any dripping moisture.

"Julia... Honey... Can you pause..." Mom breathed, and my sister obeyed, pausing mid-motion with my penis halfway in her mouth, looking over at Mom for further instruction.

"Take it out of your mouth, honey. Robert, will you turn around so Mommy can see your penis?"

I think I understood. Mom was about to cum, or "orgazm", or finish, or whatever it was called, so she was wanting some visual stimulation to help her over the edge.

I turned around to give my mom a better view of my penis. To enhance the experience for her, I lifted my right leg up and rested it on the couch, and pushed my crotch out a little bit to get my penis a little closer to my mom.

While continuing to rub herself with her right hand, Mom's left hand slowly went up and she began to lightly stroke my penis, squeezing it gently at various points as her hand loving traveled up and down the shaft, occasionally fondling my testicles.

"Your brother has a really beautiful penis, Julia," Mom informed my sister. It felt pretty good to hear her say that about me.

"Yeah, I really like it," Julia agreed. "It's, like, it's a lot bigger and nicer than the ones in the uhm, in those videos you showed us."

"Oh, baby..." Mom groaned, staring longingly at my penis as she continued to stroke and squeeze it in her hand. Then suddenly she gripped it tight, almost to the point that it was uncomfortable. At this time her body tensed up, her legs straightening out in front of her, and the sound her fingers made became more and more moist until finally a jet of hot fluid shot out from my mother's vagina. Or at least that's what it sounded like.

Soon after, Mom seemed to relax, her fingers now only very slowly rubbing herself, and her grip on my penis lessened.

"Mom, did you just cum?" I asked her, looking down at her exhausted body, her soaking vagina. She must have just had an orgasm because her body reacted in nearly the exact same way as Julia's did when I had made her orgasm earlier.

"Yeah," Mom said panting a little. "Now it's your turn, honey. Turn back around for your sister. Julia, go ahead and suck your brother's penis again. This time, when he's ready to cum, I'm gonna stroke his penis so he cums over your face. All right, guys?" Mom's eyebrows went up and she look between me and Julia. We obeyed our teacher. I turned around and Julia got started sucking again.

As Julia sucked, Mom got into position behind me. She rested her head on my shoulder, watching my sister's work, with a view that was almost identical to my own.

"I think your sister is a big fan of your penis, honey," Mom said in a sweet quiet voice. She began lightly kissing my neck and the right side of my face. She gently wrapped her arms around me, holding me with one arm around my chest, and the other around my belly. It was this hand which she would soon use to masturbate my penis over my twin sister's face. It felt nice to be hugged and kissed by my mother while Julia was working on giving me an orgasm. My sister looked up into my eyes as she sucked. She never let my penis fully exit her mouth, and she breathed heavily through her nose.

"Julia... Mom..." I said, before I even registered that I was about to cum.

"Stop sucking, honey," Mom instructed my sister, who reluctantly released me from her mouth, a thin strand of saliva temporarily connecting her lower lip to the head of my penis.

Now Mom took my throbbing penis in her right hand while continuing to hold me close against her. I felt her breasts and her hard nipples against my back. I felt her wet crotch pressed hard against my right ass cheek.

Mom began to stroke me now, allowing her hand to slide quickly up and down my shaft, avoiding the head of my penis, which I was almost happy for now because of how very sensitive it had become.

"Get a little lower, Julia. Tilt your face up a little bit, too," Mom instructed my sister. "Pull your hair out of your face, too. This stuff can kinda get stuck in your hair," Mom explained.

Julia obeyed. She settled into a lower position, partially sitting on top of her folded legs. She tilted her face up at about a 45-degree angle. Finally she used her hands to clear her hair away from her face.

"Close your eyes, honey," Mom instructed Julia. "I can feel him tensing up, he's gonna start any second now," Mom said. She was right.

Julia closed her eyes just in time for the first spurt of semen to land over her closed left eye, reaching up to her forehead and partially down her cheek. Mom steadily stroked my shaft as I continued ejaculating. The next several spurts landed over Julia's nose, on her forehead, one more streak over her left eye and eyebrow, and on more over her closed lips. When she felt the moisture on her lips, she opened her mouth and swallowed the small amount of semen she was able to capture with her tongue.

My orgasm was dying down, but a small amount of semen was still steadily pumping out of me, thanks to my mom's steady motions. I think if I had been doing it myself, there's no way I could have landed every spurt cleanly over Julia's face. Mom was right to do it herself. She's always been a great teacher; never afraid to get involved in any way that might benefit our education.

I pushed my groin out a few inches, just so that whatever leaked out of me would still reach its intended destination. Julia took the hint and inched forward, turning her face up more towards the ceiling to catch what was dripping down on her.

Finally, nothing was coming out any more, and the wonderful sensation in my penis began to subside. I was a little sad that my orgasm was over -- I would have had fun continuing for minutes, or hours -- but at the same time, I was completely satisfied.

My twin sister's eyes remained closed. Her face glistened with moisture, and semen was beginning to drip down her face, falling from her chin down to her chest in a steady drip.

"How was that, baby?" Mom asked my sister. Her head was still next to mine, and she continued holding my body close to hers while still stroking my shaft, more slowly now, and still being careful not to touch the head too much.

"It's really warm. I dunno, it's kinda nice," Julia said, her eyes still closed. A small amount of semen had fallen from her upper lip and into her mouth as she spoke, and she quickly swallowed it.

"Wow. Most girls really don't like it..." Mom remarked. "Like... they hate it."

"I guess that's not surprising," Julia replied casually. She carefully wiped the moisture from her eyelids and carefully opened her eyes. "I mean, if I was doing this with someone other than my brother, it'd be pretty weird."

"Yeah," I agreed. "it really must be wild for kids in public school to learn about this stuff."

Julia shuddered at the idea of having anyone other than her brother's penis in her mouth, or semen on her face.

"I really don't like the sound of that," Julia remarked. "I just mean, I can't imagine being comfortable enough with someone else to, like... actually be able to enjoy this kind of thing." she explained.

"Yeah," I agreed. And I meant it -- the thought of someone other than my sister taking my penis in their mouth was almost disgusting to me. But with Julia, it wasn't disgusting at all. It was wonderful. I guess Mom falls into the same category, too. It would have been pretty weird to have anyone but her or Julia jerking me off there at the end. It would have been gross. It might have still felt good physically, but it would have also felt unnatural.

After a few more minutes, Mom had Julia go to the shower to get cleaned off.

As we were all getting dressed for the rest of the school day, Mom kept saying stuff about how maybe now it seems gross to us to be sexual with people outside the family, but later in life, things would change.

But Julia and I just kept looking at each other incredulously when Mom said anything like this. Why would she seemingly want us to be sexual with other people?

And what would even be the purpose of that? Julia and I are almost always together. It's not like we would need to rely on sexual gratification from others on any sort of frequent basis. And after high school, we were both going to the same college together, and it was local so we aren't even moving out of the house.

Why would we need to rely on anyone else? Why would we want to? Plus, we had Mom to rely on too. It didn't seem like it bothered her to do this kind of stuff with us, and she was obviously affected just by watching Julia and I learn about sex. She even played with my penis while she was masturbating. That meant she was attracted to me, right? And if that was true, doesn't that mean Mom and I could rely on each other for this kind of relief? I even wondered, briefly, if Julia and Mom could rely on each other too.

These are the thoughts that ran through my mind during the rest of the day's lessons. Around the time 3rd or 4th period hit, I had already begun to look forward to the next day's sex ed lesson.