I can only tell you what I did--but it was a different sitch, though. First there was flirting, then sex was mentioned jokingly, then talked about seriously when the timing was good--no stress, no expectations, relaxed quiet time. At the time, it worked. It worked right up until the point that I think he got scared--maybe it was too much too soon. It was a pretty intense week or so.
So, maybe set the stage, approach it gradually, then wait for a good quiet time to broach it seriously. I kept it light, even when it was serious. I think there was some random, joking sexual reference, and then I think I may have said something along the lines of, "Sweetie, I'm ready when you are," and then dropped it. I let him take it from there.
And if it should happen, don't do like I did and let the neediness show through.
