Angelica
Ok then…Wow…first story ever, yay! Disclaimer: I don't own Ao No Exorcist the only thing I own is my OC Angelica.(P.S. this is Angelicas backstory most of my stories will be about angelica and her adventures mostly animeverse but big changes to the original plot P.P.S. sorry about the whole "oh wow another child of Satan…How original -_-" thing.)
Shiro looked down at the three tiny babies in Yuri's, cold, lifeless hands. Shiro couldn't kill innocent children, he just couldn't, that kid smiling at him didn't help much either. He put the sword down but when he heard footsteps behind him he held it back up as if to shield himself and then realized who it was, he didn't…no couldn't say anything. "What's wrong Shiro? Weren't you ordered to kill them?" Mephisto asked with a smirk on his face. Shiro's glasses shadowed his face as he replied grimacing "I can't, I'm sorry." Mephisto had a snug look on his face "care to make a wager?" "What kind of wager?" Shiro asked. Mephisto replied "if you can raise two of them as humans…you win, if one of them awakens to his full demon power… their souls belong to me." It was Shiro's turn to smirk. "One tiny problem, there are three babies here." Mephisto didn't look surprised, Shiro was a clever one." I'm fully aware of the girl… I will raise her as a demon; I can't sheath both of their powers in the sword, kurikara." He then sealed rin's powers into the sword and Shiro replied by putting a paper with odd writing on the sheath. Angelica was crying making loud wailing sounds not like a humans but not exactly evil sounding either. Shiro picked up Rin and Yukio one in each arm, Angelica cried louder and flames grew bigger with the loss of warmth and Mephisto picked her up and cooed at her making her stop crying and her flames went down. Shiro had already left. Mephisto sighed, "tut…tut…tut, what a bother this is going to be… but oh so entertaining." He smiled a devilish grin. "Ein, zwein, drei!" he vanished with a puff of smoke and reappeared in his home and plopped down onto the couch sighing, How am I supposed to explain this to Amaimon? How am I going to hide this from Satan? Am I going to hide this… her, from Satan? "Ok, first things first, let's find you somewhere to sleep...Eh?!" he looked down and saw that she was already asleep on his chest. He put one finger down and put it in her hand and she squeezed it, hard. Not hard enough to break his finger but hard enough to show she had abnormal strength. Just then Amaimon walked into the room, a lollipop in his mouth. It immediately fell out when his jaw dropped, and then he regained his composure and looked down at it in disdain. "Aniue… what is that?" Mephisto smirked at his brothers reaction, "that, my dear outoto Chan, is you're new little sister." Amaimon walked up to her cautiously and poked her in the side. She immediately woke up and started crying making her flames erupt. Amaimon jumped back yelping. Mephisto shouted "you baka! She was asleep!" Amaimon snatched her up from Mephisto and looked at her and snarled "shut up." She paused for a second and her flames went down… *cricket cricket* She settled in his arms and snuggled closer to him falling asleep once more. His eyes softened and he sat down on the floor her still cradled in his arms, he softly cooed to her. He looked back up at Mephisto "Fine… we can keep it."