The day went smoothy but I was eagerly waiting for college hours to end.Then after college hours I went in the lab, she was relaxing on her chair. I w...ent in and stood in front of her. She saw me and gave a naughty smile and said to help her in the store room to arrange things. I obeyed and went in. she pushed the door and closed it and hugged me tightly from back . then she said that she is not sexually satisfied with her husband and wants to get that satisfaction from me. I was in the 9th. They have been studying together for about a month and he was always complementing her, always touching. it was this night that they kissed for the first time. My ex-wife told me she knew it was wrong but she could not stop. His hands were all over her body. Did not take long to get her clothes off. When his cock came out she could not believe the size. She told him she would just give him a blowjob because there’s no way that would fit inside of her. As she took his cock in her mouth she would. She put her hands on my buttocks and pulled me in tight; when our bodies connected she leaned in and gave me a deep kiss. Her tongue slid gently in my mouth and had the sweet taste of her drink on her lips.While kissing, she reached down and slowly stroked my cock, which hadn’t had a chance to get soft. Marie’s hand was paying particular attention to the head of my dick which was stinging with anticipation.I pulled back just a tiny bit and slid my hand down between her legs and slowly started. Again, I thought this was all just playful banter.We did a few more races. We're sitting next to each other on the couch. I'll admit, after the spanking comment I was definitely trying to move closer lol. I continued to be lippy and sarcastic and at one point he just goes "alright, that's it" and pulled me down onto his lap. I'm not fully across him, basically my chest is in his lap. But it's enough that he can reach down and give me a few light swats. I don't know if he was still just joking.