Scott: dominance and submission - he loved it when you'd become dominant and take over, leaving him submissive for a change. It always turned him right on.
Stiles: begging - stiles had a thing for being in charge and you were totally okay with that. He would love it when you'd beg for him, and often that would get him off.
Derek: bondage - he would love to tie you up with rope and then have his way with you. You found it new and exciting but he was really into it and it seemed to work each time.
Isaac: oral sex - this was Isaac's thing. He needed someone who was magic with their mouth, and you happened to have some magic qualities. You could do such a good job that he wouldn't even have to help.