Harry Potter: Me, Myself, and I

A story set in a parallel world. The Dark Lord won the war. Everyone Harry cared about was killed, and Harry lost the will to live. But the Killing Curse only took the fragment of a soul inside him. And something unusual happened: he wasn't the only one to return to the world of the living. Salazar Slytherin, who had existed only in history for a thousand years, returned as well. Open ending. Harry is both the top and the bottom, and someone has an unrequited crush on him. ←_← Theme: