During the Tri-wizard tournament, every boy and some of the girls in Hogwarts want to sleep with Fleur. Harry just wants it more than most. Enough to turn to dark magic to help him.
When Harry discovers that he's a Metamorphmagus, his and Hermione's sex life takes a turn for the... different.
Teddy Lupin might be Remus' son, but he took more after Sirius. The new Ladies Man of Hogwarts is on the prowl, and has some fun at teh expense of the Potter family.