>>2161689As others have pointed out, a near/ruined orgasm is really the best way to get started.
My wife and I share my cum all the time. (I have no interest in another man's cum, but sharing my own is still taboo and subversive and we both enjoy it on that front, plus how intimate it is.)
We went full snowball the first time or two- she blew me to a full orgasm, and then kissed the load of cum back into my mouth for me to swallow. Overcoming that refractory was HARD and we only managed it once in a while, I'd back out pretty frequently once I'd orgasmed.
I'd realized that when I had a near-orgasm, I was still raring to go and was HAPPY to take my cum, and then when she went back, my actual orgasm a moment later was absolutely SAVAGE.
I say near-orgasm rather than ruined orgasm, because to me there is a distinction. A near orgasm is when you get super close and then you "leak" cum. Not a little, like a full load. But it doesn't shoot/pulse in the same way. You can and usually do stay hard, and you can keep going within seconds. There's no orgasmic release or pleasure.
A ruined orgasm "shoots" and leaves you getting flaccid afterwards, can't go again right away, but you also didn't get the orgasmic release/pleasure/endorphins.
So anyway, I asked her to start blowing me and once I started to get close to orgasm, she'd slow down and get very gentle, then right when the buzz was building and I was about to hit the point of no return, I'd tell her to stop. If the timing is right and she doensn't move, I'll fill her mouth with cum in a near-orgasm, and then we can get to sharing and playing. It took practice to get it down but we can now do a "double" (meaning a near-orgasm with a full load of cum and then a screamingly strong real orgasm with a smaller load of cum) any time we decide to. After that second one, I'm done for a while.
After we got good with doing those double and cumplay, it naturally transitioned to doing the same when I fill her pussy.