Couple of things,
First I think that I REALLY need to step back and let them be alone in order for him to really let himself go.
and
Second, I seem to be fostering a more than sexual relationship between them. I find their passionate kissing and caresses almost as erotic as the sex and I don’t know why. At one point after she rode him to (her) orgasm I actually go so far as to tell him “it’s not just about sex it’s about emotion too, you need someone to be there with you, to snuggle up with you, spend the night with you.” – Keep in mind he is newly divorced and now very much alone. - My wife in a breathy voice says “yea”. I clarify I’m talking to him not her and she says I know, “I agree though”. I don’t completely understand this part of myself, and that is a little bit frightening.