I fucked my sister in law

This happened around 4 years ago when I was still with my ex. We were living in her family’s guest house since we have a daughter together and as you can imagine the house was full of people. Including her 2 sisters. Once is a lesbian and the other one was married at the time. We got into the habit of going to a taco truck pretty far from the house almost every weekend, they loved it.

Well one weekend, everyone was busy but me and her and we decided to go by ourselves, I didn’t think anything weird from it. On the drive there she started opening up about her marriage, how she was really young (23) and she regretted marrying so young. How he was putting his hands on her and was really violent with anger issues. How she wanted to explore more sexually but he was very vanilla. She told me how submissive she wanted to be and be treated like a slut. I was very caught by surprise and was just laughing it off kind of advising her to leave him and go pursue that. After we got out good we parked in an empty parking lot and ate, still talking. I told her how her sister, my gf at the time, had cheated on me online twice already and I tried asking her if she knew she had cheated on me in real life. She said she had no idea.

She then started asking me about our sex life and things we’ve done, one thing led to another and we started making out. I grabbed her hand and put it on my dick and she immediately pulled it out, licked her hand and started stroking me. Then she started giving me head. It was so good and sloppy, she deepthroated my dick with no problem and all I did was lay back and enjoy it. I remembered what she said she wanted to experience so I started grabbing her by her hair and fucking her throat, and she did nothing but take it. She spat all over my dick as she sucked it til her car seat was literally drenched in spit. Then she took her shorts and panties off and got on top of me and started riding tf out of my dick. All i heard was her ass clapping against me every time my dick went in and out that tight warm pussy. I didn’t even think about the fact I was fixing my gfs married sister. After a few mins we got out, she got on all fours in the back of the car while I was standing outside and I started fucking her from behind. We were both moaning and grunting from how turned on we were and her wet pussy kept making a gushing sound. She was loving it. When I told her I was about to cum she started throwing it back on me and said “Cum inside me”, I did with no doubt because I knew she was on the pill. Fuck it felt amazing.

After we were done and got dressed, we started going home. The whole ride we kept talking about how this was going to stay between us, and she kept reaching over to grab my dick smiling and laughing. I knew it was the beginning of something wrong but fun.