For what it's all worth, Benedict does seem to be enjoying himself, and taking pleasure in the act on its own; perhaps he's not good at many things, but, well, here's one.
Mother might not be too proud, but she doesn't have to know.

Sensing that he's yielding the right results, he smiles faintly, stopping for a moment to gather a spare handkerchief from his dresser, which he holds in his free hand in preparation for Colin to finish.
...he just isn't able to have the sheets washed as often as he'd like. Times are hard.