I was waffling for a while on which of Stiles’ parents was the god, but ended up settling on his mom for the AU.
Both Stiles and Lydia’s mothers are part of a triple goddess who primarily preside over life and death (amoung other things). Unfortunately, the triple goddess are also the only ones in the pantheon who die, by cycling through the Maiden, Mother and Crone. The cycle ends with death and then starts up again with rebirth, but as an entirely new goddess, with no memory of the previous life. The Sheriff isn’t aware of the cycle and Stiles isn’t inclined to tell him about it, afraid the knowledge would just hurt him more.
Stiles is convinced that his mother giving birth to him drained her and ended the cycle earlier than it would have gone, had he never been born.
Corvids are familiars of the triple goddess, though. And while the goddess that was his mother doesn’t recognize him as her son (the same with Lydia’s mother, when she eventually ends), her magic/nature does, and crows and ravens naturally flock to both Stiles and Lydia to act as guides. They are also not particularly fond of Derek at first and there will be a lot of fur pulling.
Lydia’s role in the pantheon is essentially Persephone/Kore because reasons.
Anyways, after the failure with Scott, Peter decides that targeting people who already have a connection to the underworld/cycle of life & death would be ideal, and two young gods (well, a goddess and a demigod) with that parentage? Hell yeah. Not wanting another failed connection and running out of time, he tries two methods: Lydia he attacks the same way he did Scott, while Stiles he attempts to get the consent of, by promising him things like more power, and knowledge of how to achieve immortality for his father so Stiles would never have to worry about losing him.
Stiles obviously refuses, even if he lies through his teeth to do it, but in the end it doesn’t matter for Peter since the connection to Lydia takes, and it eventually allows him to crawl his way back out of the underworld.