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Stiles has a thing for Derek, and also maybe a little (okay a big) thing for Derek’s armpits.
“Really, Stiles?” Stiles heard amusement in Derek’s tone, but his voice was a little breathless too, so Stiles assumed this was all good. “I knew you liked seeing me work out but I always figured it was a muscle thing.”
“It’s an all of you thing.” Stiles’ breath made the hairs move and tickle his chin, and Derek squirmed. “The muscles are good too, but Jesus, Derek. I don’t know. It’s just a thing okay? Your armpits are hot. Deal with it.”