A loves his job. He's a fairly laid-back high school teacher, friendly with his students but strict enough that they can't pull anything on him. It's obvious that a few girls have a crush on him but he's not going to touch that with a ten foot pole; he's too invested in his career to let something like a juvenile tryst destroy all his hard work.
B is a relatively new student. She showed up in the middle of the previous semester and while she doesn't seem to have many friends, she seems well-adjusted. She's barely on A's radar and that's perfectly all right with her.
Life goes on as it should until B turns up on A's step one evening and everything goes black. When A comes to they're some place he's never been before and B's at the window with a gun in hand. Turns out, A is someone very, very important with the sort of power no one's ever seen before and B's been watching him this whole time, ready to whisk him out of harm's way if need be. A's not sure he believes her, but he can't really argue when the world seems to be falling apart around them.
Someone to play A? I'd love to see anyone like Ryan Gosling or Tom Hardy for his face, suave and a little bumbling at the same time, but obviously able to hold his own. It can be het AND slash (B is a shifter, as far as I can tell, but I haven't decided on their true identity yet). Creativity and world-building is a definite must.