It had started innocently enough, or at least Blaine tried to think so; he didn’t want to think Kurt was purposely doing this to him, didn’t want to think he was that cruel.
An interesting slit across the front of his shirt, a forgotten undershirt, an extra undone button. All easily explainable and clearly thoughtless; definitely not a conscious action on Kurt’s part and definitely not Blaine’s fault if he stared a little longer than was proper for school.
Then came booty camp and Kurt in a jump suit, for heaven’s sake, Blaine is a teenage boy, he is not built to function when his boyfriend is wearing a jumpsuit and all he can think about is pulling that zipper down with his teeth and how convenient it is that it ends right around Kurt’s hips.
It’s around then that some small part of Blaine thought Kurt might be doing it just a little bit on purpose.