"Both," Derek replied, because it wasn't mixed or confusing to him at all. "I'm not picky about the order." He could smell Stiles' growing arousal, and his conflicted feelings about it were obvious, and so made a decision. "So, why don't you finish up down here, and then join me upstairs--in your room." He hadn't fucked the boy there, yet, and perhaps the familiar surroundings would put Stiles at ease.