Domination

I do wish that Mistress would 'do' something of a sexual nature 'to' me that is purely and selfishly for Her pleasure, probably something I do not enjoy, but something she repeats from time to time, makes me request, and makes me thank Her afterwards.

That would be perfect.

I think the reason I wish for this is because I would know She is doing it purely for Her pleasure and because She can - not for my pleasure.