Cliche' Away!!! *blasts hero theme*
1. Detention is a lovely time/place to seduce one's students.
2. The action on the Quidditch pitch can't come close to comparing to the action inside the locker rooms.
3. Circle jerks (or the equivalent for girls??) are a longstanding tradition in boarding schools. What happens when two of the boys/girls (any house, any generation) end up with wandering hands?
4. The Room of Requirement is stubborn about creating a room for sex. What do two frisky students have to do to get a bed in there, anyway??
5. A swim in the lake at midnight turns into something else when two students/professors/headmasters/house-elves/centaurs end up bumping into one another.