Becoming a Devil...But Also Something More?

As I lowered my head, I felt a sting at the back on my head...Pride. My pride, to be specific. Pride that seemed to have been increased as I awakened my Sacred Gear.

My pride felt slighted as I bowed my head.

My instincts told me I could find a way to heal my sister without Gremory-senpai's help...but I'd rather not rely on such intangible thing.

Pride? Who cares for pride. I apparently have the blood of two heroes running through my veins. I've apparently inherited their spirits, as well. I'm talented, good-looking, I have brillaint health...and yet I'd give it all up if my sister could be healed. So, who cares for pride? For such selfish and arrogant desire as to keep my head high and ask for no help? I...don't care for pride.

Pride cannot save my sister. Bowing my head to my senpai can. It's as simple as that.

"P-please, raise your head, Leo-kun!" I felt Gremory-senpai's hands try and pull me up, but I didn't budge and just shook my head, to which she carried on, "I'll make sure she gets the best doctors the Underworld has to offer, so just raise your head, okay? You're not a Servant to me. You're a member of my second Family, my Peerage, okay? Family don't need to beg and bow to one another," she said and lifting my head and looking at her, I was...dazzled by her smile.

Gratitude. Warmth. Happiness. Hope. It all flooded me as I looked at the genuineness of her promise. I, who was good at picking up lies, couldn't even sense a single bit from her.

"...Thank you, Gremory-senpai," I said with a smile, "Then, please, reincarnate me. I promise I'll try my best to not disappoint," I gave a wink, feeling genuinely happy for the first time in what felt like forever. Just the hope that my sister could possibly be cured with Magic...it had put me on cloud nine.

Going a bit red from my playful flirting, Gremory-senpai nodded before standing up and picking up the red Rook piece that looked different from the others. It thrummed with energy.

Seeing my curiosity at the piece, she smiled and held it up, "This is a Mutated Rook piece. When a single piece is not enough, a Mutated piece always will be," she explained before bending forward and pressing it against my chest. Like with Issei, a flash of red, originating from my chest, spread through the room.

But just as it began, the rugged voice spoke in my head, [A Mutated Piece? Haah~ It might not be enough...best to mutate it some more, right?!] it was neither calm nor bored sounding. In fact, the voice sounded quite excited. [I'll give you a step up over those Red and White Bastards, so...don't let me down, boy! This generation will be the Gold Dragon Emperor's for sure! Hahaha!] as the voice spoke, I suddenly felt a change. A thrumm from my heart which echoed through my entire body.

I felt my body fall from the sofa, down onto my knee. I brought a hand up and clutched at my chest. It took me a few seconds to figure out what I was feeling. To figure out what was making my vision go black and my ears to be filled with an erratic buzz.

Pain.

Pure, unbridled pain.

Somehow, I kept my mouth shut and didn't scream like I wanted to but that didn't stop my expression from morphing into one of experiencing extreme pain.

My Sacred Gear summoned itself on it's own and the energy that flowed from the gauntlets and boots was back, but this time it was much more savage. It flowed through my body, ripping and tearing, while also building it back up in tandem with the Evil Piece that had just entered my body. It felt horrible.

Like I was a lab rat.

More and more energy flooded into my body through the armor on my limbs, and I felt like a balloon ready to pop. Just as I was reaching my limit, I felt the Sacred Gear de-summon itself...and then everything went black.

. . .

Opening my eyes, the first thing I felt...was how solid I felt. Like before I was made of wet cardboard and now...now I was made of rock. It was a stunning change. Especially as I sat up and felt like I'd lost no degree of flexibility of mobility.

But such thoughts of this incredible increase in physicality...were cut off when I realized someone had wrapped their leg around mine.

"Hrmm..." the sound of someone waking up alerted me and I looked to my side with speed that would no doubt break my neck if it weren't for my new defense.

Crimson hair, splayed around her and over my mattress. Sleepy blue eyes that looked right at me, a mirthful light in them as she saw my slightly flustered state. But the thing that grabbed most of my attention? The fact that she was butt-fucking naked!

Tits! Ass! All of it was on show! My god, the thighs! The THIGHS! Milky white pieces of perfection--

"...G-Gremory-senpai, what are you doing in my bed?" I asked, unsure whether this was actually happening or not.

"Hm?" she asked, her eyes opening a little more. She moved herself up into a sitting position, looking at me the whole way, giggling as she saw my eyes dip down to her bare chest, "After I reincarnated you last night, you're energy suddenly went berserk and you passed out, so I stayed with you through the entire night to make sure you were okay and so I could keep your energy under control. Why? Do you have a problem with me being in your bed?" she teased with a light smile on her face.

I looked at her, dead in the eyes, for a few seconds before I just lay back down, "I must be dreaming," I mused to myself, feeling like I was in a very lucid dream.

Waking up with a beautiful senpai in your bed? The both of you totally naked?

That kind of stuff only happens in Anime.

But the 'dream' persisted as she spoke, "A dream? Do you usually have dreams of waking up next to me, Leo-kun? I'm flattered," she giggled as she said this and I felt her getting up and off my bed. I didn't forget to open my eyes just a little bit and I practically saw everything. I guess the carpet matches the drapes and that red hair is completely natural, huh?

Knocking such an Issei-level thought out of my head, I opened my eyes fully before realizing that we were in my room. Guess I can't keep ignorantly wishing and hoping for this to be a dream, right?

"But who would have thought one of the Princes from Kuoh Academy...would have so many Idol posters in his room?" she said with a teasing tone as she slipped on his underwear.

...Ah.

Seeing that my hobby was already found out, I just stayed lying on my bed, "...I forgot about those," I said with a weak chuckle, turning my eye to look around my room. Idol pictures and posters, stuck to my wall, alongside a few rather risque anime girl posters. Welp, there goes Gremory-senpai's respect for me.

"Oh, and Leo-kun?" she asked, drawing me from my gloom, "Please, call me Rias from now on~" she gave a wink before exiting the room and walking toward the bathroom.

I just lay there...a bit baffled, I'll be honest. I've dealt with girls before. I haven't had a girlfriend, sure, but having a bit of fun with a girl during middle school? Of course I've done it. But dealing Gremory...No, Rias-senpai, just feels different.

[Move your brain out of your dick and back into head, boy! We've got training to do!] the rugged voice came and I was shocked into jumping like a cat that had had it's tail stepped on.

"W-what?" I asked, calming myself before coming up into a sitting position and swinging my legs off the bed, "Wait a minute," my expression turned serious and maybe even a little anger, "You were the one who--" I was cut off by the voice.

[Speak inside your mind so that girl-sibling of yours doesn't wake up and think you're insane,] the voice said and I realized my mistake, quickly speaking in my head.

'You're the one who caused that pain yesterday, weren't you!?' I angrily commented and got what felt like a...shrug in return? How does a disembodied entity even shrug?

[The Mutated Piece would have worked for now but when you grew in power it would have only limited you. So I mutated it further with my Dragon Aura. Don't worry, it only gives you benefits. Like a stronger body and being one tenth Dragon! Isn't that brilli--] I instantly cut him off with a disbelieving look.

'One tenth Dragon? I'm pretty sure I'm a Devil now,' I said with a confused look.

[Yes, yes, you're a Devil now but you're also 1/10th Dragon. You've also kept a lot of your human traits because of your Hero blood strong-arming them in past the Evil Pieces magic. I must say, that Red-haired fellow you descended from is quite a kindred spirit of mine,] the voice said and I instantly held up my hands in a gesture I knew he could see.

'Okay, okay, hold up! How the hell am I one tenth Dragon just because you mutated the Evil Piece further with your Dragon Aura?! You're saying things as if I'm meant to know what the hell they mean!' in a 'rare' show of annoyance and confusion, I snapped at the voice.

Who only laughed in return.

[Calm down, kid!] he said with a teasing tone, [Evil Pieces make you a Devil through changing your body, following instructions places inside them via Magic. Kinda like Magical DNA instructions. I simply changed the Magic a little and made the Evil Piece, and therefore you, partly something of both Draconic and Devil origin. Don't worry too much! No one else other than those Red and White Bastards will realize what I've done and they won't say anything either. And like I said, you'll only gain benefits from it!] the voice excitedly said, and I was beginning to feel like a lab rat.

'So...what does my Draconic nature give me?' I asked while sighing and pinching the bridge of my nose.

[Well...more potential, for one. Better senses. A harder body and stronger muscles. A better healing factor. But this will only really come about as you progress naturally anyway. Translation? We've got a lot of physical training to do, boy!] the voice said and a question I'd had until now was finally spoken.

'Okay, I'll get dressed and ask Rias if she knows anyone who'll look after Anna...but seriously, and don't block me out this time, who are you?' I asked with a serious face.

[Heh,] I got a laugh in return and just as I thought he was about to block me again, he continued, [You're speaking to the Gold Dragon of Annihilation, kid. A Heavenly Dragon. Though I guess I was more of an Evil Dragon, honestly. But none of that matters right? Not to you, anyway...The names Crom Cruach. Don't make me repeat it.]