The Sister of Satan

Prologue

Hey hey! Got back from school and I'ma be updating! Yipee! Onward with this adventure~

Seikatsu's P.O.V.~

I was by Yuki's side, holding onto her hand and encouraging her as she had her battle.

"Come on, you can do this Yuki! Just a little bit more...!" I encouraged and bit my lip to keep from screaming in pain from the grip she was holding my hand. I scrunched my eyes closed and only opened them when I felt a familiar presence and snapped my head to the front on the cave.

"What's wrong?" Yuki asked tiredly, she was definitely exhausted but nevertheless, had a smile on her face as she held her two baby twins. It seemed that it was almost time for her to go and I smiled softly at her.

"Nothing, just a familiar presence, that's all. Don't worry about it." I waved off, wanting her to be happy until she went.

"Is that so?" She smiled and closed her eyes. "Shi?"

"Hai?" I replied, intrigued as to why she called my name.

"Can you promise me that you'll raise my children? I feel that I won't be able to..." She softly said and I smiled sadly.

"Of course, I promise on my life. Although I still don't approve the fact that my brother is using you as a vessel." I frown, voicing my thoughts.

"Hahaha! There's nothing to worry about, Satan is actually a great person if you get to know him." She laughed softly and I pulled my hair.

"But I do know him and he's not..." I grumbled, pulling at my hair still.

"Don't do that, it ruins your beautiful hair." Yuki fussed and patted my hair down. I was crouching next to her as she laid down so it was fairly easy.

"Hai hai..." I mumbled, not caring about my appearance.

"Satan? Brother?" A new voice said and I whipped my head towards the entrance to see two people, both I knew.

"Ah, nice to see you again Mephisto. How's True Cross Academy?" I asked, not fazed at all. I had went to True Cross to become an exorcist to defeat my brother. I don't care if he's my brother, he killed innocent people for no fucking apparent reason.

"It's nice, although you refused the title Paladin. May I ask why?" He bowed and I sighed.

"I don't care for an important title, I'm Upper Class First aren't I? Isn't that good enough?? Geez." I exclaimed, rubbing my hair.

"Hey hey, where's my greet?" The man next to Mephisto exclaimed and I shook my head.

"I seriously wonder if you truly are a grown-up Shiro." I shake my head.

"Ma, how cold! So what did you say about Satan and brother? I'm curious." Shiro said, a serious look in his eyes. I motioned with my eyes at Mephisto as if to ask if I could say and he shrugged. I growled at him, my invisible tail swishing.

"Yea, don't freak out ok? Everyone else knows but you. I'm basically the sister of Satan. There, I said it." I rolled my eyes and searched his eyes for any sense of horror but I found none.

"Why aren't you scared?" I curiously asked, my tail swishing as well.

"Demon or not, you are still you. After all, you were still a demon even before, just that I didn't know. If that was your true nature, then I don't mind. Besides, you had plenty of chances to kill me but you never did. I'll just continue to believe in you and hope you don't char me to bits." He shrugged.

"Hahaha! As expected of the current Paladin!" I laughed.

"So what were you sent here for?" I asked when my laughing died down.

"I have to kill those two." He said, pointing to the twins in the arms of a frail Yuki. My eyes widened when I saw that the one on the right had blue flames surrounding him.

"The son...of Satan?" I murmured and looked at Yuki for an answer in which she, unfortunately, nodded to. I sighed and turned to face Shiro.

"I'm sorry, but I can't allow that. I swore on my life to raise her children and I'm not breaking that promise whatsoever." I sighed. I've been sighing a lot recently, haven't I?

"Well the, how about I propose this?" Mephisto exclaimed and we turned to him. "A bet!"

I groaned. Of course it has to be a bet. That's just like him.

"What is it?" I begrudgingly asked.

"If you two can successfully raise these two until they're teens as humans, than you win! However if you don't I take them." He grinned maliciously and I sighed.

"...Deal." I reluctantly agreed and Shiro hesitated.

"Shiro." I said and he looked at me.

"Do you really wish to kill two innocent babies just because they are related to Satan? Well do you?" I asked sternly and he sighed.

"You're right, I don't. If I did, that wouldn't have been me." He sighed frustrated.

"What's up with all the sighing?" I mumbled and shook my head.

"Anyways, Yuki." I turned to face her as she weakly smiled at me and I smiled back.

"We will raise your children. If anything happens, don't worry, we'll watch over him. Also, what are their names?" I asked and she looked at her children before looking back at me with a closed eyed smile.

"The one with blue flames shall be Rin and the other will be Yukio. I hope you take great care of them." She said, her voice barely audible before closing her eyes with a smile on her face. I took the one with the blue flames since it wouldn't affect me and Shiro held Yukio.

"Oh, a parting gift." Mephisto said and snapped his fingers. The blue flames surrounding Rin disappeared and went into Kurikara.

"With those blue flames, it'll hardly be a bet so I did you a favor." He grinned and I shook my head.

"I seriously wonder how the hell I'm related to you." I mumbled and exited the cave with Shiro.

Well, here's to a new life! I thought.

Done done done! Are you satisfied? If not, I have some more chapters coming up~ 

Aya~