Happy Birthday, Harry! (& Neville) (слэш)

AU. Severus Snape flirts with a handsome man in a pub. That man is a musician who plays hauntingly emotional songs. Severus kisses that talented man.
The next day is Severus Snape's first day as a professor at Hogwarts.
And guess who is a seventh year in his potions class? That same musician.
Severus is totally and utterly f*cked, isn't he? Especially when Draco Malfoy warns Severus off of Harry.
Severus tries to deny his longing, but fails.
Liberal use of the word "F*ck."
A little ficlet for Harry and Neville's birthday (a day late.)