How to tell her

My wife and I have been married for 20+ years, I wanted to have a MMF with her she picked my 1st cousin. He was all up for it, we all went out takeing and after awhile came back to our house and the party started. After a while the wife was worn out and went to relax, I walked downstairs with cousin to dress and let him out, I saw his dick was still hard and could not stop myself. I sat on the sofa and he fucked my mouth and I loved it. I want to tell my wife that I like sucking dick I just dont know how??

More details about what happened from when you noticed his hard dick to when he started fucking your mouth would be interesting. Did you know he would be ok with that? Maybe he will tell her for you.

you could work into telling her gradually and in a subtle way by first sucking a dildo while you are playing with your wife. tell her you think it would be hot to get a cock stiff for her pussy. she will probabaly like it.