attackfish

I think this is the first time I've read a story where Sirius is hoist on his own petard and can't get Severus to believe it's dangerous to go to the Shrieking Shack without hurting Remus. I could actually believe your Sirius and this somewhat less heinous reason for the "prank." And you nicely left it ambiguous as to whether Snape is actually gay or whether it is just wishful thinking on Sirius' part.