"My thought was in such a boy showing signs of fiendish ancestry may cause others around him to question him for the sins his parents must have committed in addition to the effects you described. As for genetics, I am still a celestial. My skin is very resilient to blows not aligned to Evil weaponry and I ward against Evil beings. One who falls merely has a change of allegiance, it does not change what they are however convenient that may be at times." She flipped her hair out of her face as part of her response and made a soft flap of her wings for emphasis.