With anyone else, he wouldn't be this sure of himself - hell, with the Scully he's used to, he wouldn't be. But there was a time when she could stand to look at him, and he knew exactly what to do to get her going. His confidence might be shaken in other places, but in this one specific area, he's still got it.

His mouth lingers at her neck, leaving a little mark over her pulse, as his fingers thrust and drag, seeing how long he can stretch the experience out - but considering just how worked up she is, he doubts it'll last much past this. Which is fine with him, really: She might have brought him in here in an attempt to get him to sleep, but he's perfectly willing to stay up until she's ready to go again after.