[Two male leads, no romantic pairing] [Harry Potter + Type-Moon + a little Good Omens] [Everyday life and child-rearing (?)]
When Tom Riddle was four, Mercurius adopted him. He thought he had met a kind-hearted god, but it turned out to be a nonhuman being with no grasp of basic human conventions. Even he himself, according to Mercurius, was not human.
“That’s right. She slipped into someone else’s family, thinking she would find lots and lots of love, just like in a fairy tale. Instead, all she found was cheap malice, and she had to go hungry every day. Along the way, her greed led her to seduce the local squire’s son, hoping to steal his future descendants, but in the end she fell in love with that man, whose soul was utterly mediocre. To keep herself from mentally breaking down, she had no choice but to replace herself. Perhaps she finally felt remorse, so she used a human name to reinforce her soul, hoping that this would keep you from repeating her pitiful fate.”
“Though I believe you and your mother are separate individuals who merely share the same magical traits. As for why she gave you this appearance, she probably just liked this body. In my estimation, it should be quite durable, and even next century it will keep attracting human attention. However, in the occult sense, you are your mother reborn as another self, with all your memories and experiences completely reset.”
“Yes, Tom. You are a witch.”