Slytherin-Madness
After Peter bit Lydia, he abducted Stiles, and without asking Stiles's consent he bit Stiles, turning Stiles, but it wasn't done without motive, because in that moment Peter could sens something Stiles could, Peter could smell it on Stiles, could feel the pull towards Stiles, Stiles was Peter's salvation, Peter's last thread to sanity, Stiles was Peter's mate, and in that moment Peter knew he had to keep Stiles by his side, and in that moment the only option Peter could come up with was the bite.
Steter.