Sev giving Harry a watch that tells Harry "when is time for sex" made me laugh. But not while I was reading - I was too absorbed into the romantic moment...later when I thought about it, it just seemed like such a funny thing. Specially the way he said it, your friends will not be able to see it -- I can just imagine Harry visiting with Ron and Hermione and then glances at his wrist watch, sees Severus wants sex; oops, I gotta go now, see you later guys. lol
Anyway... I did love the story! The drunken letter...that was a pure desire.