Mutual Help

They both got in the bathtub in the bathroom next to Katherine's room. She went in totally naked, while Alan wore his swimsuit. He was much more concerned than her about taking the teasing and touching too far, especially because of his mother's new mood. He was aware that their mother could get nosy and figure out that the two of them were in the bathroom together. But at least the door had an interior lock, which they used.

Katherine lay across his lap. They were as quiet as could be, so their mother wouldn't hear. Katherine was frustrated because she wanted to say things like, "Your cock would feel so much nicer than that brush sliding on my ass," but Alan wouldn't let her whisper, much less moan.

Alan used a rough, Brillo-pad-like brush to scrape her butt repeatedly. Then he used the remote shower nozzle, which was on a hose, to wash away the loose paint. Then they repeated the process over and over. Eventually he got her butt cleared of every last speck of paint, but it took over twenty minutes.

Then she turned over, and he shifted positions and did the same to the front. It finally came down to just her pussy that needed cleaning. She got on all fours so he could get to her pussy and ass from behind.

They couldn't talk, but Katherine could see how he was reacting by the giant lump in his swimsuit.

Her pussy area was the hardest to get clean, because of her pubic hair and pussy lips. Luckily, her labia became fully engorged whenever he brought his hands near them, so that helped expose all the areas which needed to be cleaned.

He tried to gently rub this sensitive area, but even so, the rough brush hurt her a lot.

However, whatever pain she felt was outweighed by intense pleasure. Her clit was fully erect. Alan couldn't resist nudging it each time he passed the brush back and forth. That delighted him, which he concealed from her.

Soon her body was rocked with a series of powerful but extremely quiet orgasms. She leaked profusely as he cleaned her pussy for another fifteen minutes. Finally, it was done.

Once again, he methodically washed off the remaining flecks of paint using the remote shower nozzle. This time, however, he set the nozzle on its most focused setting, using the jet of powerful water as another way to pleasure her.

But when everything was cleaned at last, Katherine didn't move from her position. She simply and silently reached out and grabbed a bar of soap, and then handed it to Alan.

He used the nozzle to make her completely wet from head to toe, then doused himself before turning off the water. Starting at her feet, he worked the bar of soap up her legs, creating a thick lather everywhere his hands went. He lathered her crotch particularly thoroughly before moving higher.

Katherine grabbed his hands and tried to keep them on her pussy as long as she could. Now that he was using his hands and not the brush, she was delighted to find him experimenting with her clit as he rubbed and stretched it. She silently but demonstratively said the word "Yes" over and over, making sure that he understood that he was doing very well.

She tried to guide his fingers into her gash, but he seemed unwilling. So after he'd made her cum several more times before finally moving on to other parts of her body, she took the plunge and began fingering herself.

However, he was willing to plunge a finger into her tight little anus, and soon he was sawing away in that puckered hole while she worked on her pussy. The cleaning was obviously over, and they were both getting carried away with sexual desire.

While Alan had reservations about touching his sister's pussy, he didn't have any problem about touching the rest of her. He continually moved his hands to explore every inch of her that he could.

He thought, I can't believe what's happening! I'm totally, like, nailing her asshole with my finger! And that's not all, not by a long shot. She's letting me run my hands over her ass like I own it!

If this were Mom or Aunt Suzy, I'd be all over it like white on rice. But this is my sister, my younger sister. I should be protecting her from this kind of thing instead of doing it to her! Besides, it's incest!

However, his hands didn't seem to be affected by any of his thoughts. He continued to hold an 'angel versus devil' dialogue in his mind. So what if it's incest? That's true with Mom too, and that hasn't slowed me down with her. Why should it be different with Sis?

I don't know, it just is! Sis is a perfect ten, don't get me wrong. She's one of the sexiest girls in school! But Mom, she breaks the scale. If I were to resist her, that would make me officially gay. And with her so innocent and prudish and all, it's like I'm absolved because no straight guy could possibly resist! Whereas with Sis, she's also my very best friend. What if this screws up our friendship somehow?

But Mom's like my best friend too! We're all so close in so many ways. Why can't we get even MORE close and intimate, like we're doing right now? What's the harm? Besides, she wants it! Listen to her horny moaning!

Oh God! I'm so sorry, Sis! You're just as irresistible as Mom is! Or Aunt Suzy! I give up!

He suddenly lurched forward, so his hands could grasp her boobs. By doing that, his thinly clad boner pressed hard against her ass crack.

Katherine loved that, but she felt it was criminal that his dick was still trapped. She turned around to face him, reached out, and freed his straining hard-on from his swimsuit. She whispered, "You've been so nice, but I should be helping you instead."

By this time, he'd been expecting this, at least mentally, but he was still surprised when it actually happened. Holy shit! Sis is holding my dick! I think she's gonna jack me off! Dang! I don't believe my eyes. And it feels soooo goooood!

Once her hands were on his erection, they didn't let go. Sure enough, she began to stroke him.

She was just as excited about this as he was, if not more so. It was a close call as to whose heart was beating faster and harder. But their feelings were a bit different: they were both extremely aroused and excited, but he was worried and freaking out while she felt a profound sense of relief.

She thought, YES! Home run! Grand slam! Touchdown! Any stupid sports metaphor just doesn't cut it, because this is IT! I've been soooo worried! First, I never thought this could happen, and lately I've been worried that it might but I could blow it, but now it's happening! I actually have my fingers wrapped around Brother's big cock, and I'm totally stroking him! YES! I wish Amy could see this; she'd be way psyched for me!

Ohmigod! It's so hot and hard and long and thick and fleshy and perfect! And Alan! It's all Alan! My brother! The whole room is spinning and I'm gonna pass out, because this is too exciting! We're gonna be lovers! Forever! I'm gonna have his babies!

Those thoughts were so exciting to her that she very nearly did pass out on the spot. She had to close her eyes and force herself to calm down a bit.

At the same time, Alan was busy lathering her tits with soapy suds and generally exploring them. This made her feel so good that it was a great struggle for her to calm her ragged breathing even a bit. She almost had to ask him to stop for a while.

Katherine had been so thrilled by the mere fact that she was stroking her brother's erection that she hadn't really put any thought into how she was stroking it. In recent years, she'd learned from reading erotic stories (usually with brother-sister incest themes) and talking to other girls about sex. As a result, she actually wasn't too bad at stroking it.

So, once she came off the erotic high of her initial euphoria, she tried to put into practice some of the things she'd read about, and thus make her brother feel that much better. One thing she knew was that his most sensitive and arousable area by far was the frenulum, the bundle of nerves just below the underside of his cockhead. In recent days, everyone had called that the "sweet spot," because stimulation of it felt so good.

Katherine stopped making long stroking motions along the full length of his long shaft, and instead concentrated on rubbing her fingers right over his frenulum.

The effect was immediate. Alan felt such a great surge of pleasure that his eyes bulged and he let out a loud, strangled cry.

Luckily, Katherine was mindful about Susan hearing and thus catching them, and she managed to put her hand over his mouth after only a second or two of unrestrained howling.

Seeing that that technique was too effective for their circumstances, she let her fingers wander all over his cockhead instead. That was also very sensitive territory, but a notch or two below direct stimulation of his frenulum.

Their mood changed. Alan had been about to erupt, but Katherine leaned into him and cuddled against his chest, creating more of an intimate and mellow mood. She slowed the pace of her stroking and fondling, and Alan responded by slowing the wandering of his hands over her body, and especially her lovely boobs.

Katherine liked this new mood as much as the previous one, and perhaps more so. It also put her head right next to his ear, allowing her to whisper sweet nothings while she continued to jack him off. "Hey, Bro. How's it going?" She giggled, a bit nervously.

"Um, good." After a long pause, he added, "Your, um... your hand..."

"I know!" She giggled some more, and less nervously this time. "I'm jacking you off. I'm stroking your cock. I'm giving you a handjob! I'm pulling your pud. I'm-"

"Okay, okay," he cut in. "I get the picture! Don't make me feel any worse!"

"Worse? Does it feel bad? I thought I was making you feel good?"

He winced. "You are, but that's the problem! I feel like I'm in Heaven!"

She started licking his ear, but quickly licked her way over to his neck and the side of his face. As she alternated between licks and kisses, she cooed, "So what's the problem? Don't you like it when your cute little sister strokes and fondles your great, big, scary cock? And you must like my tits, seeing as how you can't get your hands off 'em."

He looked down at his hands and felt a wave of guilt. At first he pulled them away, but they came right back mere seconds later. Aw, who am I kidding? Whatever moral reservations I have are getting trampled. It's like tanks versus chariots. I'm neck deep in sexy fun with Mom and Aunt Suzy, and it's gonna happen with Sis too. I know it, she knows it, everyone knows it, so what's the point of feeling skittish about it? It's the natural thing, the next step in our love and our lives. I have to just go with the flow and accept it and even revel in it, instead of fighting it!

He suddenly turned his head. Using a hand to hold her chin, he guided his lips to hers. As soon as their lips locked, they kissed in a way that they'd never kissed anyone else before.

In truth, his reluctance had to do less with worries about incest and more with fear of the unknown. He especially feared that adding a sexual dimension could somehow ruin their close friendship. Plus, he'd already been extremely stressed out about what was happening with his mother and Suzanne, and he felt that he couldn't handle another stressful situation. But kissing her just felt so good and so right that all of his worries seemed to melt away.

Katherine had already felt exhilarated just from knowing that she'd managed to get this far without him getting upset or pushing her away. So to have him initiate an ultra passionate kiss was like a gift from the gods to her. She was so delighted that she felt like she was flying.

Oh, Brother! You love me! You really do! Love me some more! Kiss me forever!

It occurred to him as he kissed her that not only was this his first kiss with his sister, but this was his first mouth-to-mouth kiss, period. It also occurred to him that this was beyond the boundaries which had been drawn by his mother. Even Suzanne had held back in doing so, which puzzled him.

At first, they were both content just to focus on the kissing, as if that were their entire world. But as the minutes passed, they remembered all the other tempting body parts. Katherine in fact had never let go of Alan's erection, and had never even stopped stroking it, but she hadn't been thinking about that at all. But she made his eyes open wide with surprise and a spike of arousal when she resumed jacking it off with a purpose.

Similarly, since Alan was such a tit man, he usually had at least one hand fondling her tits while their necking continued for many long minutes, but he hadn't been thinking about that consciously at all. His other hand had generally alternated between exploring her ass and pussy, and sometimes helping knead her tits, or just running up and down her back, but that also was all on pure instinct. It was only after she resumed her handjob in earnest that he started paying more attention to what he was doing with his own hands to the rest of her body.

She thought, I've never felt this hot before! And my nipples have never been this hard and erect before. Never! I've never felt my heartbeat pounding in my ears like this before either! And I've got his great big cock in my hand, and it's hard because he loves me and wants me! Maybe he even wants to fuck me! It just doesn't get any better than this! I hope I don't have a heart attack from all the excitement.

Eventually he wanted to go further, so he started kissing her jaw line and neck. As he did that, he muttered, "It's no use. There's a part of me that says this is wrong and I should resist, but I can't! You're too beautiful and sexy and tempting. I love you too much! And dammit, this just feels too good!"

She corrected him, "No, it feels too GREAT! Beyond great! Brother, this was meant to be, and you know it! Don't fight it! My hands were meant to stroke your cock. This is who I am: I'm your slut, your sister-slut!"

He was going to protest that, as he didn't want her to use the word 'slut,' much less 'sister-slut,' but she immediately followed her comment with another passionate lip-lock, and they were off to the races again.

She thought as they made out, This! This! THIS is what I want! I want to hold this moment forever! I don't care if it's wrong, or even if he objects; I want to be his sister-slut! Hell, I AM his sister-slut! He's the one I love, the man I would marry if only I could! I don't mind so much that I have to share him with Mom and Aunt Suzy, and maybe even Aims eventually, so long as we can do this every night!

She was so turned on by thoughts of having sex with him every night in the future - for years to come - that she started stroking his cock frantically.

But what she didn't know was that, by this point, Alan's dick had been ready to erupt for so long that even a little more stimulation would push him over the edge. Given her sudden surge of lust, he stood no chance - he began cumming almost immediately. Since they were still pressed tightly together, he shot his seed all over her tummy, up to the undersides of her boobs. His cock pulsed and throbbed as shot after shot of hot semen splattered against her skin.

She was a little freaked out about his cum splattering all over her, but she loved the fact that she was the cause. She continued to stroke his hard rod to coax out the final spurts. After squeezing out every last drop, she rubbed his hot seed into her skin using the remaining cool soapy suds, though most of those were already gone since the two of them had been fondling each other for so long.

Alan finally stepped out of the shower, totally spent.

She silently mouthed the words, "Thank you, Brother," and stood up. She used the shower to get herself wet all over again, in order to wash off all the cum. Then she lathered herself with soap once more, not because she really needed to, but because she knew it would make an extremely arousing sight for her watching brother.

Sure enough, Alan couldn't miss that, even though he was flaccid and still reeling from his orgasm. He stayed for a few more minutes and slowly dried himself with a big towel as he watched his sister sit back down and rinse off her sexy body with a sponge.

He thought, God, she's too young, but I'm so ready to fuck her. She may not have an inhumanly large rack like Aunt Suzy and Mom, but she still would be as good a fuck as anyone in school, I'm sure. And being with her would probably be just as much fun as with the other two, but in a different way. I'll bet she's got a much tighter cunt, for one thing, and I hear that's something really worth fucking. Most importantly though, she's my sister and I love her. That alone would make the fucking really emotionally intense!

Shit! I'm not a bad guy, but how could anyone in my position turn down such beautiful women? If Mother Teresa or the Dalai Lama were here right now, they'd be sticking something into her cunt, I swear. I shouldn't feel bad. There's just no way anyone could resist a display like this!

In the shower, his sister spent much more time with her hands roaming over her pussy and breasts than she did rinsing off the soap.

He was amazed that her pussy could take so much rough stimulation in such a short time and still apparently want more.

As if reading his thoughts, she turned towards him and winked invitingly. Between what had happened at school with Kim and the fulfillment of her long-time fantasies with her brother, she felt sexually insatiable.

He left before another round of fun could begin. They'd already spent an outrageous amount of time in the bathroom. With Susan home and in the kitchen, it was a near miracle that their time together hadn't already led to trouble.

The day's events with Katherine had erased Alan's earlier depression over what had happened with his mother. Although he was no longer getting help from his mother, or openly from Suzanne, he'd found in his sister someone else to occupy his thoughts and keep him horny while his father was at home. He looked forward with great anticipation to additional sexual hijinks next week at school, since he now knew that he would secretly be painting both Katherine and Kim for five days in a row.