"Is he... is he always like this?" Stiles asked, a little breathlessly, as Isaac rocked on his finger and Derek rocked against his back. Stiles was pretty sure he would come right then and there if not for the cock ring. Biting his bottom lip because he had no doubt he should be studying what Isaac was doing, Derek sounded so please with the werewolf, Stiles added a second finger to the one currently inside of Isaac.