"You like that, hmm?" Derek hummed, and added a third finger, pursing his lips as he watched the way Stiles' pink rim stretched to accommodate him. "Like being called a whore?" He caught Stiles' earlobe between his teeth and nipped, sharply. "A slut?" He ran his other hand down the curve of Stiles' ass before pulling back, smacking his cheek with his open palm, firmly.