One easy way is ask him or try to put is palm between your legs. Ask him to press.This is least invasive and more plesurable. just try.
Hi: It is interesting why he's only touched it when you were broken up. In any case, he may have a fear of hurting you, or of not knowing how to touch you in a way that would please you. I myself would feel selfish if I enjoyed receiving oral sex from my girl and I did not reciprocate somehow--either with my hand or oral. Most guys don't mind using their hands to pleasure their women, but some have reservations about oral sex for one reason or another. I hope at least your lover will, over time, become more comfortable with the idea of pleasuring you with his hands, at the very least.
But, to answer your question, perhaps when the two of you are in the midst of foreplay, you could gently take his hand and guide it to somewhere near your V--such as your thighs or lower abdomen--and have him caress you in those areas. You could gradually work him toward your V--maybe not that particular time, but some time after that, so he does not feel pressured. See how that works and let us know how things go. I wish you best of luck in getting through this.
Just take a chance. Google prostate massage. You will find 4 types of massage. You can do at least 3 types without any problem. It may stimulate his penis.