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Celestial X Grimoire (DXD Celestial Grimoire)

A fanfiction set in Highschool DXD where our protagonist has a special ability called 'The Celestial Grimoire'. This fic features genderbent characters, expies from other series, and a lot of lewdness. Also Known As: My little sister can't be this much of a degenerate!? Incest is Wincest: Red Dragon Empress Version. Tomoko the Red Dragon Degenerate Empress.

YiteWrite · Anime & Comics
Not enough ratings
14 Chs

Chapter 1.

Basic Elemental Zap - Generic Magical Girl - Destruction (100 CP) (Freebie First Roll)

This is your standard magical girl magical energy blast attack – follows whatever theme you and your team use, be it the classic elements, colors, fruit flavors, or something else. Starts out pretty weak, able to knock out a normal person, a low level mook, or break a window, but still weak enough that major enemies will be able to just swat it aside. Grows in power the more often you use it, but using it more than a few times in a fight will tire you out. Work at it enough, and you'll be knocking holes in brick walls when you want to.

I woke up in my bed, to the sound of my sister's alarm clock from the other room.

"Imouto, wake up," A muffled husky voice of her alarm clock sounded out from her bedroom, "If you don't. Then I should wake you with… a kiss"

By Kami, I hated having to listen to stuff like that every damn day… but my precious little sister had practically turned herself into a NEET.

If my parents and I didn't constantly pressure her to go to school, I just knew that Tomoko would stay in her room playing otome games while grumbling about not being popular.

"Oh no, I'm going to be late!" I heard her shout through the thin walls. Quickly looking to my own alarm clock, I saw that she was right.

Just another normal day for Ryuuji Hyoudou, I guessed. So I got out of my bed and quickly made my way to the shower, just barely beating out my little sister who was once again too slow.

"Agh no!" She cried out as she tried to run after me, but I made sure to close the door and lock it in her face. Lest she try to 'save time' again by attempting to shower with me.

That was an awkward enough situation once… it's not like the two of us were kids anymore, after all.

Ignoring my sister's desperate knocking on the bathroom door and her cries that she was going to be late, I hummed a little song that I vaguely remembered hearing as I cleaned my body under the running water.

Quickly getting myself cleaned, I got out of the shower around ten minutes later, wrapping a towel around my lower body, and walking outside I saw… my sister just sitting by the door, lying in wait.

"Onii-chan!" She roared, as she tried to tackle me, or more likely the towel that I was wearing.

But she was tiny and uncoordinated, so I quickly dodged out of the way, leaving her to crash into the wall.

"Shower's free," I said with a small smirk, as I continued walking over to my own bedroom, closing the door behind me and locking it… before locking the other locks as well.

She'd tried picking my lock when I was sleeping last year, and almost succeeded before mom caught her. So I decided to make it a lot harder for her.

Putting on my school uniform, I took a look at myself in the mirror.

To be honest, I don't know why my eyes were red and purple. But it was at least a kind of cool look.

I made sure to style my hair a bit, Shitori-san would get on my case if I went to school with such a case of damp bedhead, after all. Especially on the first day of the new school year.

After I had finished grooming my hair, I went into the kitchen in order to make myself some breakfast.

When I went in though, I saw my dad sitting in the living room watching the news, and my mom was washing last night's dishes.

"Good morning," I said with a small smile, as I grabbed some bread and placed it in the toaster.

"Ah, good morning Ryuuji-kun," Mom said with a smile, as she scrubbed a plate, "Did you sleep well last night?"

"Yeah, I slept like a baby," I said, causing her to light up a little bit.

But I was lying… I had the strangest dream last night.

It was as if I was floating around in a world of books, until a particular one caught my eye. Going towards it, I opened the book and felt some sort of overwhelming knowledge overtake me.

And then I woke up, feeling this sort of energy coursing through my body. And the instinctive knowledge that I could… fire magic blasts.

Which was insane, because magic wasn't real, so I was probably losing my mind. But I didn't want to worry my family over it.

I nearly flinched when the toast popped up, but I quickly calmed down and grabbed some butter out of the fridge, before spreading it over my breakfast.

There wasn't nearly enough time to make an actual proper breakfast. I'd woken up too late for that privilege.

And as my sister came tumbling down the stairs, putting one of her socks on, I gave a small sigh… even as I smiled at her antics.

She may have been a bit of a perv and an absolute NEET, but Tomoko was still a really charming girl. Even I'd admit that as her older brother.

Tomoko Hyoudou, my precious little imouto had long and messy dark hair, bright and expressive green eyes, and a rather petite frame that the Kuoh Academy Uniform hid, she looked at me frantically before I gestured to the other plate of toast that I had made for her.

"Thank you so much, Ryuu-nii!" She exclaimed, as she quickly took a bite of the toast, before wiggling in contentment.

"Oh it's alright," I said, as I quickly finished my own breakfast, "Now hurry up. We don't want to be late."

She just nodded, as she quickly finished the first slice of toast before grabbing the other and placing it in her mouth.

Then she ran out the door, probably thinking to herself that she looked like a cute anime girl at the start of her slice-of-life anime.

I knew my sister after all, and she was the type of NEET to think of everything in terms of anime.

So with a small laugh, I grabbed my bag… before grabbing my sister's one that she had forgotten, and followed after her.

"Hey, wait up Tomoko!" I shouted from behind her, as she continued running as fast as she possibly could to Kuoh Academy.

Though, her fastest running speed was still not as good as my casual walking speed.

So eventually, she got tired and stood against a tree to catch her breath, sweat pouring down her body, before she looked up to me.

"Huff… huff… what do you want, Ryuu-nii?" She asked, before I dropped her bag onto her back, causing her to fall to the floor, "Ungh!"

"You forgot your bag," I said with a small smile, as I helped her up, "Now come on. We don't want you to be late"

Honestly, I was kind of worried for her health. That was a three minute run… she should not be gasping like she was at death's door, about to meet the Shinigami itself.

"Alright, just- just give me a few minutes- waaah!" Tomoko cried out, as I picked her up and put her onto my shoulder.

I still had seven minutes to go before getting to school after all, and school started in ten.

Plus, I was pretty sure that Shitori-san would chew me out for not getting her to school on time.

And besides, it's not like my little sister was heavy or anything.

So, with my little sister panting heavily on my shoulder, still exhausted from her short sprint, I walked the rest of the way to Kuoh Academy.

As I was reaching the gates though, I felt small fists pounding on my back. But it wasn't like they hurt or anything.

Honestly, it felt more like she was using one of those back massagers on me. It was actually sort of soothing in a way.

"Let me go, Ryuu-nii! Lemme go! I don't want to be seen like this" Tomoko desperately told me, still so concerned with her popularity… or lack of it.

I didn't understand though, wouldn't she be more popular if a handsome man like myself was carrying her all the way to school?

"Ah, alright," I said with a small smile, as I unceremoniously dropped her onto the ground, before dropping her bag on her.

"Ugh! You didn't have to drop me like that" She muttered, as she slowly got up, before struggling to pick up her bag, "Agh what's in these, bricks?"

"I wouldn't know, it's your bag," I told her, causing her to open it… before quickly closing it with a bright blush on her face.

"A- ah… oh no" She muttered to herself, her face beet red as she struggled to look at me.

"Hm? What's wrong?" I asked, did I give her the wrong bag or something?

"Y-you gave me… the wrong bag" She squeaked out, causing me to peer inside of it to see…

Wow, that was a lot of hentai. Like, a lot. How did she even cram that many into a single bag?

"…Why was this in your bag?" I asked, causing steam to practically rise from her head, that's how red she was getting.

"I- I was running out of room… s-so I was going to put it in the shed? B-but I got distracted. Oh Kami, my reputation's going to be ruined" She whispered to herself in horror.

I had to fight the urge to ask her 'What reputation?', as it was pretty well known that she was an unrepentant pervert. Even if she tried to keep it on the down low.

Then I looked at her, and couldn't help but sigh at her pitiful appearance.

"Alright, new idea then…" I said, as I quickly grabbed her, picking her up and placing her back onto my shoulder.

Then I grabbed her bag with my other hand, making sure that it was fully zipped up.

"W-what!?" She squeaked out, as I made sure to support her lower body with one of my hands, "Ahn~?"

"We'll head back home and just miss the first class today. Not like it's anything important anyway" I told her with a shrug, before starting to walk away from the school gates.

I noticed some other students making their way to the school, and while the two of us got some small odd looks that made Tomoko shrivel up into my shoulder, it wasn't anything that I couldn't handle.

"O-Okay… I guess that's fine" Tomoko said, as the two of us began to go all the way back home.

As I was walking though, I could vaguely hear the sound of a page being… torn? Huh, maybe that was just the insanity setting in.

Gotta think of a distraction, because I didn't want to think about that sort of stuff right now. I can deal with my oncoming craziness at a later date.

"So uh… incest? Really?" I asked after a moment, causing my sister to let out the most adorable embarrassed sound, "I mean. I knew you were perving on me… but you were really reading Older Brother on Younger Sister stuff?"

"D-don't say it so loudly!" She cried out, as she pounded on my head, causing her lower body to jostle, and me to instinctively grope her behind to keep her steady, "Ooh!?"

Huh, she was a lot softer down there than I expected, her ass was bouncier and larger than her frame would indicate.

"P-please… stop." She muttered into my ear, as I grasped her a bit more, before eventually stopping.

"Okay, maybe not that. But what about that other stuff I saw? I mean there was some real degenerate shit there... monster girls, breeding? Handholding?" I mock gasped, as she grumbled in my ear, silently pleading with me to stop teasing her, "And don't even get me started on the most debauched one… NTR? Really? For shame, Tomoko. For shame."

And I couldn't help but laugh at her cute reactions, as the two of us finally got back to the house.

"I- I'll just go inside myself. You don't have to see anything!" She told me, a very flustered tone in her voice.

"Alright, just tell me if you need anything," I said, as I set Tomoko down, and gave her the bag as she scurried inside the house.

Damn, now that I think about it. I could have had an actual breakfast instead of the plain buttered toast that I had… ah, it's probably fine though.

Then I heard the sound of my sister running up the stairs, before coming back down. And from the sounds of it, she was carrying something rather heavy.

She then opened the door… and I watched as she dragged two bags into the shed, before closing it behind her.

"You had two bags of that stuff?" I asked incredulously, as she walked past.

"Y-yeah, I needed to make some room for… stuff," She told me before scurrying back inside and coming out around five minutes later with her actual bag, and two juice boxes.

She quickly handed one to me, and the two of us went back inside. Mom wasn't home and neither was Dad.

Dad was likely at work, so Mom was probably at the store getting stuff for dinner. Which meant that the house was free for the next hour or so.

"Um, here… I guess we're staying for a bit?" Tomoko asked, as I noticed that she passed me a grape-flavored juice box, before looking back to her to see that she was sipping on her own watermelon-flavored one.

"Yeah, we might as well. I could probably just say that our alarm clocks were busted… we haven't been late enough for the student council or teachers to think we're lying" I said, before taking a long sip of my juice.

"Ah, yeah. So um… do you want to play some games?" She asked me, twiddling her thumbs a small amount.

Costume Switches - Symphogear - Illusion (100 CP)

Hm? What- oh. Right. This collection of ordinary looking fabric tags was exhumed from a Pagan site just a few miles off the coast of Italy. Each one is labeled with a general theme: 'Christmas', 'Halloween', 'Yukata' and so on. When clipped onto any outfit, armor, even a Symphogear, the design and appearance of the gear will be modified according to the theme while still providing just as much protection- even if it seems like it doesn't. There are over a thousand of the little fuckers here, so you could surely find a switch for whatever you need in here, right?

"Hmm, no. I don't think we have time for games… I'll make us some breakfast though. What do you want?" I asked, causing her eyes to light up.

"Oh, oh! Can we have pancakes? I think mom has some batter in the pantry!" Tomoko asked, causing me to laugh lightly.

"Alright then, pancakes it is. Just try not to get too much of my batter on you" I teased a bit, causing her to flush slightly, before giving me a leering grin, as she pressed her hand into her face, resting her elbow on the kitchen bench.

"Oh you don't have to worry about that, Nii-chan~ I'd just eat it all up," She said with a leer that reminded me of some sort of perverted old man… not my little sister.

"…Just, just go. I'll make you some pancakes" I said with a sigh, as she laughed while walking away.

I let out a small laugh as she left, before walking into the pantry and finding the pancake batter inside of it, stashed away in a corner behind most of the junk food.

"Huh, how long have we had this thing?" I muttered to myself as I struggled to open it.

Checking the expiration date, I saw that it wasn't anywhere close to that thankfully.

Eventually, I managed to tear it open… but at that same moment, I heard the sound of paper tearing yet again.

Then there was a second one, and I nearly collapsed from a torrent of knowledge that manifested in my mind.

From what I could tell, I seemed to be able to summon something called 'Costume Switches', I think? Little tags that could change the appearance of anything I was wearing into a predetermined outfit.

Okay, okay I can… I can deal with this. I can totally deal with this.

And hey, maybe I can actually summon one of these things to see if they're real and maybe I'm not going insane. I couldn't just fire a magic blast inside or at school after all… if it were real, that is.

So with a single thought, I summoned one of the tags that would change my outfit into… a naked apron.

Then I nearly dropped the pancake batter in shock, when a simple tag appeared in my off-hand.

"No… no" I muttered to myself, as I looked at it. The tag was rather small and written in Kanji, was the words 'Naked Apron'.

I took a deep breath to calm myself, and clipped the tag onto my collar. Watching in wonder as my outfit changed in an instant.

One moment, I was wearing the Kuoh Academy Uniform… and now I was just wearing a frilly white apron and nothing else.

"O-oh wow!" I heard muttered from behind me, causing me to whirl around and see Tomoko peeking around the corner.

Nearly instantly, I pulled the tag off as she closed her eyes, causing my outfit to revert back to normal.

"Ryuu-nii~ I didn't think- wait what the!?" Tomoko shouted, as she walked around the corner with a little pervy grin, before faltering and looking at me in shock.

"What is it, Tomoko?" I asked, forcing myself to remain calm, as I poured the pancake batter into a frying pan.

"I-… nothing, I was just um, wondering how the pancakes were going?" She asked after a moment, causing me to smile as I showed her the pancakes that were forming in the pan.

I tried to keep a brave face on as I made the pancakes. But internally?

Internally I was screaming. After all, I had… I had fucking magic. Magic was real!

What the actual fuck!?