(We had met Kevin again, and agreed that he should fuck my wife occasionally until he got a girlfriend.)
A couple of weeks later, she said she was starting her period.
"I thought there was no danger of you getting pregnant," I said with a mixture of concern and relief.
"No, no," she said. "Of course not, you idiot! But I realised something. The time I got you to bring back Tom, Dick and Harry, and also when I suddenly suggested Kevin before we had planned was about the same time after my period. In other words, I was ovulating, and desiring sex at my most fertile time. That's mother nature for you."
"Oh," I said. "So that is when you would not only want to be fucked but also to feel the sperm shooting inside you. Well, that seems like a good idea for a time with Kevin, if you want it."
(If she wanted it? Who was I kidding? And I had learned the thrill of knowing another man was pumping copious seed into her, and seeing the proof afterwards.)
So Kevin made a visit about once a month (though we never told him why.) It was strangely domestic rather than odd to have a man come in, in order to come in my wife, but I fully enjoyed it. Meanwhile, she rarely used the dildo, but we made love often.
However, there was also the matter of getting to see him ejaculate, which we both wanted to see. (Though we said it was for the other's benefit, really.)
So having calculated her time of 'probable maximum lust' she asked for him to visit a week before, just for the evening, to shoot his load for us and return the next weekend to stay over.
So another experience. Kevin sat on the bed and a naked woman knelt in front and stroked and twirled him. Not as complex as she had done with Tom, as the main thing we wanted was her hand going up and down. I had not been so near when she had given the others their first Christmas present so had time to take in the details as I recorded it close up. I rather enjoyed it, with my tracksuit bulging accordingly.
And when he came it was truly spectacular. She had cum in on her face and hair and tits, and some on the carpet, missing the towel we had put down. And I missed it. I was in too close, and as he came he also sort of thrust, and his cock twitched up with the spurts. (Of course it does! I had seen it often enough myself.) And I was trying to move out and with the direction of the spurt, and was going the wrong way, and got nothing better than a blur before I dropped the phone. Was my face red!
She laughed like anything. So we said we would wait an hour to make sure he was well recovered, and try again. And she went to have a wash.
This time I got further back to allow room for the stream. Obviously he took longer. This time, I was a bit stimulated and slightly erect, but could not actually enjoy it as before, while concentrating and worrying. Then he came, not nearly as much, but good enough. (About the same as me, if I am honest, on the first time. I don't think I've seen a second time since I was a teenager.)