My wife is a very good tennis player and has a crush on her coach
We were at a dinner party at her friend´s house. Her tennis coach also attended. She was wearing a fluffly white dress underneath a tiny see through thong.
It was a big house with lots of wide rooms. Her tennis coach came and greeted us and stood by chating with her, then I went to cheer another friend and both of them went for a drink. Then I lost sight. They wen into a dark room. I peeked and went in. They were busy and didn´t notice my presence. They kissed and then he stepped behind her lift her dress and pulled down her thong. He pulld down his trousers and underwear, hold her by her hips and bent her over, then he spread her legs and entered his ** into her **. Then begun thrusting her slowly at once and then more rapidly. Her dress just flowed up and down.
I was there! They didn´t notice. After during dinner she sat close to him and didn´t look at me during the entire dinner...
Of course you knew it was a dark room, before you entered, and clearly by opening the door the room would light up, so that ruined that story. And if it were dark you wouldnt see all those details. I love a good fantasy story.