Holmes has to kiss that grin, and the kiss becomes lingering and tender despite his intention; once he starts kissing Watson, sometimes it's simply difficult to stop. He sighs comfortably when he finally draws away, giving Watson a very relaxed smile. The process of washing Watson is very soothing, very appealing, probably because Watson is so intensely his right now.

"Of course, since I am being so helpful, I may as you to return the favor," he teases in return, then takes a drag. "Have you gotten all the honey out of your moustache? That was a very peculiar sensation, by the way." His lips quirk in a smile.