Harry Potter and the Hogwarts Internship

Snape survives Nagini's attack in book 7. After the war against Voldemort, Harry goes back to Hogwarts to ask Snape for an internship. Unable to hide his feelings any longer, he also asks Snape out. Snape declines but gives him the internship. However, since they spend so much time together, it's inevitable that they grow closer. Snape/Harry slash. Warnings inside