It was all Derek's fault. His fault for kissing him in the first place, his fault for getting them to this weird middle state that surpassed vague enemy of my friend and settled more firmly in maybe possibly friends, and Derek's fault for jeopardizing it all in one fell swoop of choosing to continue to kiss Stiles when it'd initially been a complete accident. It was probably the first time that he blamed Derek and also thanked him (in the privacy of his own head, thanks) in more or less the same breath.

Which he was losing because of kissing Derek.

He hadn't really mastered this whole kissing and breathing at the same time thing and he sucked in short sharp little breaths when he pulled away long enough to tilt his head the other way, slipping his tongue between Derek's lips to slide against his teeth and that was weird, that was so weird, touching someone's teeth with his tongue and also so awesome and he didn't want to stop, ever. His hand slid off his hip, slipping around to press flat at the small of Derek's back, as if he could push his body closer against his.