Yeah, he is still pretty shy about talking about specific sexual things that he liked or didn't like. It's as if the entire experience is so wonderful for him that it is all just one big awesome blur of an experience. I dissect what happens, I recall and I put into chronological order so I can write. This solidifies and clarifies it all for me, but for him it seems to blend together.
What I gather from him is that his favorite moments are specifically when having sexual intercourse with her and knowing that it is okay with me because I'm holding his hand or telling him or making eye contact with him. For him I seem to be more of a conduit than a turn on. i.e. the threesome or even a twosome between them wouldn't happen if I weren't there, but he doesn't get turned on by looking at me, per se.