Last day of school fuck for my wife

My ex wife and I were into group things but she very rarely would go out and do things on her own. I did finally get the full story of onr of those times:

She is/was a school teacher. During the school year she would often stay late doing paper work so she was in her room many times when the janitor came by. He was a black guy, nice, she said and flirty. At the end of the day she found it fun to return his flirtations and over time they exchanged first hugs, then kisses, then tongue tangles and the occasional teasing feel.

The last day of the year he came into her room said, let's say good by for the summer. They started making out with her sitting on the edge of her desk and him standing in front of her. He started feeling up her tits through her dress. She told him she was afraid someone might come in and see them. In response he got up, locked the door and closed the shade over its window. When he turned around she said he had his cock out. She made no comment and he came back and they went back to playing around. She spread her legs and wrapped them around his thighs leaving only thin panty cloth between his cock and her pussy. He whispered in her ear that they should remove her panties and fuck. She said something about being married and not wanting to cheat on me and also that she wasn't protected and it was a dangerous time of month. He suggested that they could take her panties off and just rub their crotches together bare. That way she wouldn't get pregnant and it wasn't technically cheating.

She was pretty horny so she agreed. Off came the panties and he returned to his position between her legs. They rubbed a bit then he said her pussy hair was rough on his cock so she spread her labia and he carefully laid his cock in her slit. She was very wet and the slippery friction was encouraging them to press harder and rub with longer and longer strokes. Suddenly the inevitable happened, his cockhead found the opening to her vagina. They froze for a second then she said, no we can't and tried to lift away from him. As she did she slipped a little off the desk and about 2 inches of cock went inside her. She looked at him and gave up complaining. She said give me a boost back onto the desk which he did by pushing forwards with his hips. The remaining 6 inches of him slid into her and they were pube to pube. Are you going to tell me not to come inside you he asked. No she said, Squirt your stuff in me.

The reamister I found out about this is because a few weeks a later I opened a doctor bill. It was discreet but she admitted it was for a morning after pill. She also reminded me that she had fucked me as soon as she got home, hoping it would help cover any evidence her married pussy had just satisfyed a black cock and was full of someone elses cum.