Realisations (слэш)

If anyone had told me, back when I was still a Hogwarts student, that I’d have a crush on the one and only Severus Snape – dungeon bat, greasy git, Death Eater, etc – I would definitely have laughed. Or, more likely, screamed at you, maybe tried to hex you, and assumed you were a Voldemort supporter.
 
Post war, slowly, Severus and Harry become friends. They studiously avoid talking about the past.
Then, after pining for a long time, Harry finally makes his move. Severus reacts well... at first.