Celestial X Grimoire (DXD Celestial Grimoire)

I woke up to the sound of Tomoko's snores, somewhat muffled by her face being firmly planted in my chest.

Feeling her hot breath on my skin, I couldn't help but hug her, squeezing my sister lover against me.

She wrapped her arms around me sleepily, murmuring something about this being her 'best sleep ever', and to 'never wake her up'.

But as I was looking down at my sister's form, I heard a tearing sound, completely ruining the mood… until more knowledge was implanted into my mind.

Royal Jelly - Wonderland No More - Transformation (400 CP)

A transparent jelly used by Flying Elephants to transform into Queens. Usually, the jelly isn't as effective on other creatures, merely healing wounds (and eating too much at once can make you sick).

However, not only does this special version of the jelly offer improved healing without the risks, but it retains the power of queens. When the jelly is fed to a wild(ish) animal, whether sapient or non-sapient, the eater will transform into a "queen" version of the species – an enhanced form that often has greater intelligence, size, power, and charisma over its own kind.

Apparently, I could summon some sort of… transparent jelly.

Now that didn't sound all that useful, but this jelly was able to cure the wounds of anyone who eats it… though too much would make a person feel a little bit sick afterward.

And if I fed the jelly to a wild animal… or something close enough to count, it would transform into a more powerful version of its species, which is smarter, larger, stronger, and can control others of its own kind.

While that was definitely… interesting, I was more interested in the healing properties of the jelly.

After all, what if Tomoko or my parents got hurt? Having this jelly on hand could save their lives…

Sure, I could use it on Ember to probably make her stronger, but it's not like I had any other wild animals.

Well unless Tomoko counted, but while she's an absolute degenerate, she's also still a human. And as far as wild as a person could get, she wouldn't go into the woods for any reason.

Sitting up in the bed, I summoned a small amount of the clear jelly onto my fingers, and gave it an experimental sniff.

It didn't really smell like anything, maybe a little sweet? But that could be some sort of placebo effect.

Well, this should be edible, right?

I licked the jelly, and found that it did have a very subtle sweet taste, but it was so faint that I could barely even tell that it was there.

Strangely though, I felt a bit better… like some old injuries I got as a kid that had mostly healed over, were completely healed.

It wasn't much of a difference, and I only noticed it because I was paying close attention to it. But it showed that the jelly could actually heal people.

Which was absolutely amazing to know, this was going to be so damn good for the future.

Unfortunately it doesn't count as a type of magic, or else I would've tried to put it into like… a ring or something, that could have come in handy. Free heals whenever I wanted.

But that's fine, I can deal with just summoning it myself. Though, I felt that the amount that I could summon was somewhat limited, but would refresh over the course of a day... like an empty jar's worth or something along those lines.

And it took some of my magical energy to do that, so I couldn't just summon everything at once or else I'd risk draining myself dry.

Now though, I had to figure out just what I was going to do with this newfound jelly, looking over to the clock it was just past 6:00 AM, so I had enough time to do some experimentation.

And so, I decided to summon Ember to my location. She was the perfect test subject, after all. I didn't want to give a mouse the jelly and have it end up ripping me apart or something like that, after all.

She appeared in an instant, and instantly divebombed towards me, the small firebird nuzzling into my chest, as I tried to keep her quiet, not wanting to wake up my snoozing sister.

I softly stroked Ember's feathered head, as she looked up to me.

"Hey girl, do you want to try some of this jelly? It's supposed to make you stronger" I said softly, as I summoned a small amount of jelly into the palm of my hand.

Ember stared at me for a second, before looking at the jelly… and instantly started to slurp it up.

I watched as the clear jelly went down the firebird's throat, and then she started to swell up, her form stretching out and growing larger.

After several moments, I watched as Ember finally stopped her transformation, and she looked… ethereally beautiful.

Her feathers were fuller, still retaining their gold and red coloration but they just looked livelier, and her eyes had gone from a simple black to a blazing blue.

Then I noticed that her body had grown far larger, she'd gone from the size of a normal bird to the size of a large dog, which was a ludicrous size difference.

And she was looking at me with honest to god intelligence in her eyes, as she softly made her way back onto my lap.

It was an awkward fit, as she was far larger now, but eventually, I was able to get her to settle on me, as she nuzzled her head into the croon of my neck.

"There there girl, how do you feel?" I asked with a soft smile, as I stroked her feathers, causing her to coo softly.

"Hmm, ah what- what the fuck is that!?" I heard Tomoko waking up from behind me, before screaming in fear.

And of course, my sister's reaction caused Ember to flare up in shock and fly backwards… even with the intelligence increase she wasn't the smartest around.

So I decided to unsummon my pretty not so little anymore Firebird, and turned to Tomoko, who was looking at where Ember was in shock.

"What was… what was that thing?" Tomoko asked, as she scooted over beside me, "Was that like a phoenix or something?"

"That was my Firebird, Ember. She's… I guess you could call her a Familiar?" I said with a small shrug, "I got her yesterday, she's a bit dumb but she's absolutely adorable"

"Uh yeah, I guess she was kind of cute…" Tomoko muttered, as she moved over to sit on my lap with a small smile, "Oh it's warm here"

For some reason, I could somehow feel Ember's indignation at my sister stealing her 'spot', and that brought a small amused smile to my face.

Looking at Tomoko who was still sitting on my lap, blearily trying to wake up, I had a little idea for a prank…

"Hey Tomoko, I got this uh jelly here… it's supposed to make whoever eats it stronger. I used some on Ember, she was just the size of a bird before… wanna try some?" I asked with a grin, as I summoned some of the jelly onto my fingertip.

I knew that it wasn't going to work, but hey… it's a harmless prank that would heal anything that's wrong with her.

Maybe it'd heal her sheer degeneracy?… Nah, that's basically 90% of her entire personality. I don't think that I would like the person she'd be without being a lewd little sex pest.

It didn't matter if she would be a 'better person', it just wouldn't be Tomoko…

"Hmm? Well uh, alright" She said as she turned to me, and saw my fingers that were slick with jelly.

And of course, instead of scooping it off my fingers like I was initially hoping, she moved her head towards my hand and wrapped her lips around my two digits.

To be honest, I wasn't even surprised at this point, of course she'd do this sort of thing.

As her tongue swirled around every part of my fingers, I could hear her let out a little moan as she sucked all of the jelly off of my hand.

Once I was sure that she was done, I took my fingers out of her mouth with a wet pop, and looked at my sister.

She looked rather flushed, and there was a bit of saliva dripping from her tongue, as she panted in front of me.

Honestly, Tomoko looked so beautiful like that… and then she started to change.

It wasn't any large or ridiculous change, mostly she grew a little bit taller and… fuller, as her bust perked up, and her ass filled out just a bit, while her hips became a bit wider.

Holy shit, the jelly was actually changing her. How did she count as some sort of wild creature?… Was it due to her sheer perversion or was it… something else?

Did she have some sort of Sacred Gear that could have allowed for this? I remembered seeing something last night, but thought it was a trick of the light.

"Whoa…" I heard her whisper, as she looked around the room with wide eyes, "Everything feels so much better~"

She said that with a dangerous purr in her voice, before she locked eyes directly with me.

Then she pounced directly onto me, knocking me directly onto the mattress, and rubbing her cheek against my face.

"Mate… mate… mate~" She whispered, her voice sounding somewhat hoarse as she deliriously moved on top of me, moving her hands under my shirt, before rubbing my chest with a content smile on her face.

Looking at her, I could notice some sort of strange red gauntlet on her right arm, I didn't know what it was capable of… but it must have been some sort of Sacred Gear.

Wracking with the fact that my sister had a Sacred Gear, I tried to get up… only to get pushed down by Tomoko.

"Come on Tomoko, we have to figure this stuff out" I whispered, as I tried to push her off of me… before I heard snoring.

…She'd fallen asleep on me, and I couldn't just move her or else I'd wake her up again. And I had no idea what that Sacred Gear could be capable of.

Damn it, Tomoko.

As I sat in my bed, looking at the sleeping and drooling form of my sister, I couldn't help but feel worried.

Whatever that Sacred Gear was, it must have done something to her in conjunction with my jelly… but I don't know just what it did.

She was acting all… animalistic for a moment there, but hopefully she'd snap out of it when she woke up.

So I was just sitting there, when I got yet another deluge of knowledge entering my mind.

Clairvoyance - Kara no Kyokai - Divination (200 CP)

The mind's eye was opened to you during a particularly dangerous situation. You desperately needed to see the danger that approached you from a place you could not see and found that, almost like a miracle, the image would appear in your thoughts. With some practice, you've learned to move your senses and perceive locations within thirty meters of your physical form. It's difficult to move while doing this, keeping track of your normal senses at the same time as your clairvoyance is quite disorienting, but you can learn to adjust with more practice. In time, your range might even expand to cover several city blocks and allow you to pierce some magical wards too. Should you have some sort of magical power or other ability that requires line of sight to work, you'll be able to use it through your Clairvoyance as if you were actually looking at the target normally.

This sort of stuff was nice, but it was kind of annoying that it happened like… ten times a day.

But anyway, I seemed to have gained some sort of clairvoyance magic.

With just a bit of effort, I'd be able to divert my senses in different directions, allowing me to see or hear almost anything in a thirty meter radius around my physical form.

Unfortunately, I wasn't really able to move while doing this sort of thing, and keeping track of my normal senses at the same time is apparently pretty disorienting.

But it can be trained, I can learn to expand my senses to cover practically anything and even pierce through magical wards… as long as it's in my range.

This is a spell with some damn terrifying potential. Sure, it's not that great right now, but in the future?

Well, this spell would allow me to basically see everything a few blocks away from me at the very least.

Hmm, maybe I could combine it with my Divination? Clairvoyance and Divination could be interesting.

I wasn't all that sure if they would actually work together, but it's worth a try, right?

But anyway, I had to get ready for school. It was already six thirty, and that meant we only had a bit over an hour to get ready.

"Tomoko, psst Tomoko" I whispered, as I slowly shook my sister, causing her to open her eyes.

"Mmm… no… don't wanna get up" She groaned as she flopped uselessly against me.

"Come on Tomoko, we only have an hour to get ready," I told her, as I gently shook her some more, causing her to try and bat my arm away.

"I'll get up in twenty minutes…" Tomoko mumbled, as she tried to go back to sleep.

But I knew that she wouldn't wake up in twenty minutes, I've done this before.

So I grabbed her by the scruff of her shirt, and picked her up from the bed.

"Agh! Huh!? Wha!?" She exclaimed as she tried to get out of my grasp.

"None of that now, we're getting ready. Come on, let's have a shower" I said as I practically had to drag her into the bathroom.

Closing the bathroom door behind the two of us, I made sure it was locked as I turned to my sister.

She was looking pretty confused, staring at me in a tired daze.

"Can I just go back to bed- oh," Tomoko started, before I started to take my shirt off, and I watched as her features morphed into a look of realization and sheer want, "Nevermind. This is fine- perfect even!"

Within an instant, I watched as she started to tear her shirt off of her body, but was struggling with it as it was drenched in her sweat, causing it to cling to her body.

"Agh! Agh! No! Nii-chan! Help!" She pitifully cried out, her shirt clinging to her body as she tried to get out of it.

I heaved a small sigh, as I walked over to my sister, and instead of taking the shirt off, I put it back on… before taking the tag off of her forehead.

Instantly, the magical girl costume she was wearing disappeared, and she was left completely naked as the day she was born.

Now that I saw her in this manner, I noticed that she had definitely filled out a bit, her ass was fuller, her tits perkier, and even her bush looked smoother.

Her hips were fuller, her skin was healthier, and her hair became slightly longer and gained a sort of glossy sheen to it.

And she was definitely a little bit taller now, it wasn't really noticeable unless I saw her up close but she had gained around an inch of height.

All in all, it looked like Tomoko had just gotten back from a spa or something like that.

I could even explain it away as a mixture of a spa day and puberty doing its thing. Thankfully the difference wasn't as drastic as it was with Ember.

"Huh, did I gain a cup size?" Tomoko muttered to herself, as she cupped one of her breasts, squeezing it slightly with a look of confusion.

"Ah yeah, so the jelly might have given you a few small… physical alterations. Your hips and ass are a bit bigger too" I said, causing her to look up at me with a grin.

"…Holy shit that's awesome. Hey, does that jelly work only once or can I keep eating it?" She asked hopefully, but that hope was crushed once I shook my head, "Ah damn…"

"Sorry, but hey maybe when you're older you'll be a bit bigger?" I said as I took my pants off, causing her eyes to light up as she started to squeeze her small tits more, "…What are you doing?"

"I'm massaging them so they grow bigger, obviously… plus it feels nicer than when I used to do it, did you make me more sensitive, nii-chan?" She asked teasingly, as she looked up into my eyes.

"Didn't know that it'd do that, but that's kind of interesting to know" I said, before pulling my underwear down, my cock stiffening at the sight of my naked sister and causing her to give me a slightly shaky grin.

Then the two of us got into the shower, it was a glass one so I quickly closed the shower door behind the both of us, and found myself rather… cramped.

My sister was rather small, but I was decently well above the average height. And this shower wasn't meant for two people to stand in.

Tomoko gave me a small grin, as my cock pressed against her stomach, growing harder and harder.

"Oh wow… is it weird that this is turning me on?" She asked, as she looked down to my rapidly hardening member, and I could feel her hot breath blowing onto my flesh.

"Not at all," I told her with a small grin, as I leaned over and turned the shower on, a blast of cold water hitting the two of us instantly.

"Gah! Cold! Turn the hot water on!" Tomoko cried out, as I quickly turned the other faucet, causing hot water to rain down on the two of us, "Agh! Too hot!"

Eventually, I managed to get the shower to a good degree of temperature, making sure that it was fairly hot but not enough to actually hurt.

The shower head let down a hard rain of water against my back, the hot water impacting against my skin somewhat roughly, just the way I liked it.

Steam began to rise within the shower, cold and hot water flowing at the same time and mixing into a warm mist, as I stared at my sister.

Tomoko was glistening with water running down her body, a relieved look on her face as she looked up to me… before she reached over to the bar of soap.

I watched as she started to slowly and sensually run the soap over her chest, a slight flush to her face before starting to go lower, as the soap suds ran along her thighs, then her legs, and eventually went down the drain.

Then she gave me a little grin, as she 'coincidentally' dropped the soap onto the floor behind her.

"Oops, I'll get that~" Tomoko said, as she bent over and started to pick up the soap, giving me a tantalizing view of her backside, water running down it in a rather enticing manner.

I couldn't help but stiffen even further at the sight of my sister's teasing actions, as she shook her ass a bit, before I noticed her looking back at me with that damn smug little grin.

"Come on nii-chan… I need some help getting the- ah!" Tomoko told me, before… slipping and falling down due to the slipperiness of the soap, causing her ass to stick out into the air, directly in front of me.

Her wet sex was just barely hidden by her dark bush, a slight wet pinkness just barely able to be seen beneath the veritable forest hiding it away, but I could also see the twitching and flexing ring of her asshole, looking like it was just waiting- no... anticipating for me to do something.

Tomoko groaned slightly, as she eventually positioned herself onto her all fours, before looking back to me with a little pained grin.

"Oops I slipped~ Now, what do you wanna do to me, nii-chan?" She asked as she wagged her ass toward me in a gyrating manner.

"Well nii-chan what do you wanna do? You gonna pick me up and use me as a fuckpuppet? Make me service you with my entire body? You gonna pull my hair, spank my ass and call me a bad girl~?" Tomoko asked teasingly, as she continued to shake her ass enticingly.

And just like that, whatever shreds of composure I had left… snapped.

I then grabbed my cock and started to line it up with her quivering asshole, the ring of muscle flexing inward and outward with each breath she took.

"Ooh! Ooh! Maybe you'll make me choke on your cock or- oh fuck!" Tomoko let out a guttural groan, as I started to push the head of my dick into her asshole, the sudden tightness constricting around me.

As I slowly started to put it further into her ass, I noticed that it was warm and somewhat wet, it felt like her tight passage was hugging my shaft, gripping onto it as I pushed further into her.

"This- oh yes! Deeper! Yessh!" My sister let out some sort of bestial sound as I reached the end of where I could go into her asshole, making sure not to do her any irreparable harm.

With my full eleven inch long cock deep into her ass, I waited for her to catch her breath as she looked into my eyes with such longing.

"Holy- holy shit! Yes- yes… fuck up my guts! Destroy my ass, big bro! I want you- I want you to make sure I can't sit straight for a week!" Tomoko pleaded, as she started to pull herself off the base of my cock, before pushing herself back onto it, her ass letting out squelching noises as she did so.

With her verbal consent in mind, I gave her a grin, as I slowly pulled my cock out of her ass, causing her to whine… before slamming it deep back into her.

"Hieee!" Tomoko squealed like an animal in heat, saliva flying out of her mouth as tears brimmed in her eyes, "Oh yes~"

Then I slowly but surely started to ram my cock further into her ass, before quickly pulling it out, and slamming it back in.

Repeating these motions, I began pistoning in and out of my squealing little sister's ass, making sure to support her body so she wouldn't fall again.

"Ryuu-nii, I- I'm- I'm cumm-" Tomoko said between gasps of air, trying to catch her breath, as her ass grew tighter around my dick, practically crushing it with how hard she was squeezing.

"Oh, it's getting tighter? Don't tell me Tomoko, did you cum?" I asked with a small grin, causing her to nod frantically, "Well that's strange. I don't think I ever gave you permission to cum. This calls for a punishment"

From the way she pushed herself further onto my cock, I was fairly sure that she had grown excited from the idea of getting punished. So it looked like I had a little masochistic slut on my hands.

"Alright Tomo-chan, I'm gonna start spanking you… and I want you to count them and thank me for every single one, do you understand?" I asked, my grin growing at her semi-delirious nods.

"Y-yesh, big bro…" Tomoko slurred, as I continued to pound her previously virginal asshole.

"Good, now start counting!" I said, before rearing my arm back and slamming it onto her ass with a resounding spank, specifically timing it so I would also thrust deep into her at the same time.

"Ahn~ one! Thank you onii-chan!" Tomoko squealed, as a red handprint made itself known over her left ass cheek, "Tha- thank you so much~"

"That's a good girl," I said soothingly, as I rubbed her ass gently, while continuing to thrust into her, feeling my own release coming to the surface, "Now I want you to take all of my cum,

alright?"

"I- fill my ass up with all your baby batter! Make my ass pregnant!" Tomoko said with a fuck drunk little laugh, before I spanked her again, "Oh! Two- this is the best! Thank you so much!"

Damn it, I loved this girl. Who else would tell me to 'make their ass pregnant' but Tomoko? She was truly best girl, the greatest waifu that I could ever ask for, heh.

I then felt my balls churning, and I started to thrust at a faster pace, pounding relentlessly into my little sister's tight asspussy.

"Yes! Yes! Fuck me! Break me! Destroy my ass! Paint my bowels white! I'm never gonna sit properly again!" Tomoko screamed like a woman possessed, as I felt the blood rushing to my cock, as it was just about to blow.

And with one final thrust, I unleashed my load into her awaiting anus, burying myself deep between her ass cheeks, hilted like it was the sword in the fucking stone in my little sister's ass.

The geyser of cum that came out was legendary, as I shot rope after rope of my white hot spunk into her little asshole, sheathed entirely into the 'bowels of the beast' that was Hyoudou Tomoko.

"Yesh! Yeeesssh! Fill me to the fucking brim!" Tomoko moaned, as I did as she asked and filled her to the brim with my jizz, some of it inevitably splattering against the shower floor and getting washed away in the drain.

I had to physically hold her up when she went limp, orgasming a second time all over my thighs.

Eventually, the cum stopped pumping out of my cock, and I felt my member softening, letting out a sigh of relief I looked to Tomoko and…

"Hehehe, my butt's pregnant~" She said deliriously as she pawed at my thighs, sitting on the floor with my semen oozing out of her asshole.

Yeah, she was completely and utterly drunk off of my cum. Or at least, she was acting that way.

So I helped her up and made sure that she was completely clean, before cleaning myself off in the shower and drying both of ourselves off with a pair of towels.

With that done, I opened the bathroom door, and when I saw that nobody was in the hall, I quickly grabbed Tomoko and ran to my bedroom.

Then I set Tomoko on my bed, I was already going to be washing it anyway, so who cares if it gets a little bit more damp?

Getting dressed rather quickly, I made sure that I looked alright, before returning to my sister, who was still giggling to herself, cum dribbling down her leg and onto my bedsheets.

"Tomoko, Tomoko get up," I said, as I waved a hand in front of her face, but she didn't even react, "Ah damn it, we'll be late at this rate… Tomoko if you get up, I'll let you do any one thing you want to do to me tonight, alright?"

She instantly perked up and sat up on the bed, giving me a terrifying little grin even as her towel fell down revealing her perky little breasts and puffy nipples.

"Ha! You said it, and you can't take that back now!" She said with a perverted little giggle, "Oh, I've got so many plans…"

"Cool, now. Go get dressed" I said, as I gestured to the door, and she quickly scurried away, cackling as she did so.

…I just knew that I was going to regret saying that she could do any one thing to me tonight. But that didn't matter, as I had to get ready.