Prompt: An old classmate of Sherlock's from Uni is found dead at his old university. Scotland Yard calls him in for assistance on the case and Sherlock has to deal with various old classmates (who weren't particularly found of him) he hasn't seen in years.

Preferably no slash. And it'd be awesome to see some reactions from some of the series characters (John, Lestrade, Anderson, what have you) when they see interactions between Sherlock and the old classmates.