I posted a story a few weeks back about my wife and I getting away for an afternoon at a hotel. It was the first time I confronted my wife with my desire to eat her out after coming on her pussy. I had discovered that if you edge to an orgasm and then press the base of your cock right below your balls, you could pump some cum out without the fear of 'going to far' and blowing your load completely. Like other posters here, I lose the urge to eat my own cum after I orgasm. It comes back in about 20 minutes, but the moment is lost. I encourage all who want to taste their own cum to try this technique. It is also erotic to see your cum 'pour' out of your cock and not just spurt. I have since licked my cum off my wife's pussy two other times. One time she even asked me if I wanted to do it.
A few weeks back the kids were at my parents, and we took advantage of this time get it on. She had just finished her second orgasm, and turned her attention to me. She asked if I wanted to do it doggy style, so she got on all fours, and I proceeded to fuck her from behind. We never had much luck at this position because she is short, and it is hard to get any leverage on the bed. After a bit of pumping I pulled out and started sliding my cock between her ass checks. I also pushed my thumb into outer opening of her ass hole. She is not into ass play, and that is about as far a I can go. But then she laid her head down on the bed and stuck her ass higher in the air, spreading her cheeks apart. I pushed my thumb further into her ass and she did not protest. I went a bit further, and got so hot that I was about to faint. I then had the strongest urge to lick some of my cum. I pumped my cock with my hand and pressed the base of my cock with the other hand like I described. A perfect pool of cum poured onto her ass check. I immediately bent over and licked it all up. She just said 'Oh, wow'. I think she was shocked that I was eating just my cum this time without the added ingredients of her pussy. I proceeded to pump some more out right on her ass hole and crack and licked it up. I then jacked to a shocking orgasm on her back and collapsed. She said it really grosses her out, but said that she wants me to me be happy. God, I love this woman.