He almost turns around to go back into the house; to go back to Klaus. He almost thinks that it might be the saner thing for him to do. But he can see the dark wave of her hair curling around her shoulders as she opens the door to a neighbouring house and steps inside. He’s helpless as his feet follow her.
So, uh, here’s Stefan and Katherine getting it on. Or something.
It’s pretty messed up. I have issues. I know this.