Wolfstar - might have mentions of sexual things Remus, Peter, Sirius and James are halfway through their second year at Hogwarts. Sirius has some ideas that he decides to act upon, not knowing how it will turn out.

Basically just jumps right into the end of their second year, when Sirius finds out about Remus being a werewolf - that's where it all starts. Also the Jily storyline is entwined within. Disclaimer: English is not my first language. If you see any mistakes, please let me know.