My Little Fallen Angel (BxB)

There was a war between Angels and Demons everything was going well for the Angels until the Demons started becoming stronger out of the blue. The Demons made bigger ranks destroying everything in their path! To put an end to it God and his Angels all channeled some of their energy to create a being that would one day defeat the Demons and once again exile them... but this being was not born an adult... no it appeared before them as a mere baby... devastated the Angel fled with the baby trying to protect it ... due to it being their last hope... but after a war raged while they were on their path to God's palace... the baby fell from heaven... just as the demons had planned they would let the mortals ruin the child so that he would become evil... everyone will see him as an outcast
forcing him to turn evil