Completed Stiles "accidentally" let it slip to a group of very popular girls that he was gay, which really meant he had a master plan to get a hot girlfriend. Stiles "accidentally" bumped into the most popular girl in school, which really meant he wanted her to notice him and his gayness, just so they could become best friends. Stiles "accidentally" made it clear to all of the openly gay boys in school that he was available, which really meant he wanted this whole gay thing to seem real, so Lydia HAD to believe him. Stiles "accidentally" told Derek Hale he'd go to the winter dance with him, which really meant he wanted Lydia to see them together and believe this whole scheme. The only thing Stiles actually did on accident, was fall in love with the captain of the lacrosse team, Derek Hale.

This is a dramione in disguise. When Draco brings a baby back to the head dorm at Hogwarts Hermione can't help her curiosity.