okay... I think ya kind of have to be inside my brain in order to understand this one.
It's Snape and McGonagall after they've been turned back into Teenagers again. Sirius and Lupin are teens and so is Trelawny. They have all been turned into teenagers.
Sirius accidently knocked over Astra's potion and it spilled all over the teachers assembled. It turned the minds and bodies back to 17. Sirius thinks Harry is James and thinks he is a god. (he has no ego)
Trelawny and McGonagall get into more cat fights than should be allowed. Snape gets his butt pummelled everytime he opens his mouth.
This is all in my 7th yr story, which I am currently writing. My friend Celia thought up the potion. I threw in a Karaoke contest and spin the bottle. Andrea threw in the twist on spin the bottle. Just another day at hogwarts!
anyway. Snape notices McGOnagall is kind of cute and he is making her blush. That's basically what's happening.
Anyway.... Harry Potter Fanart.
Artwork © Copyright 2002 Ehren Hatten
Er... JKR herself said in an interview that McGonagall was "a sprightly 70". Dame Maggie Smith was one of her first casting choices for McGonagall. The books never said that McGonagall was young when she taught James and company; only that she was around at the time. And my mother will be 60 this year, and still has black hair. It's called hair dye. ^_^
Still, this is not to say that a picture of a cute teenage Snape and McGonagall making eyes at each other is not a very cute thing indeed. Which it is. ^_^