The doctor arched, hand coming up to thread through the blond locks as the other laved his nipple with his tongue. A thread of pain shot through him, making his crotch throb hard against what little remained to cover it. Absently lifting his hips so he could rub against the fabric, Kabuto gave Naruto's length a few healthy strokes before teasing his fingers over the head, then down the underside with feather-light touches to cup his sac, thumb rubbing across it.