At least a few weeks. If she kept it up, he might not get bored of her by then, or for a long time. But for right now... his attention was all Serenity's. He shrugged his shirt the rest of the way off, and positioned himself behind her, bringing a hand down firmly on her ass. "Then just tell me if I pull your hair too hard." How could he resist?

Pushing forward, his other hand guided his cock towards her slick folds, rubbing the head against her for just a moment - and she wasn't going to be very patient, so he drove into her that next moment.