M22 I had Sex with my Sister-In-Law

My Wife and her Sister Never had a good relation. They Are always arguing and literally hate each other but there was this one dispute which make it to the peak. Since this they never talked to each other again. After a couple weeks her sister texted me that she wants to come over and talk to her. My wife blocked her on every platform. I told her that my wife is now at work but later when she is Home you can come. She said okay. After 1 hour someone knocked on the door. Her sister came. I Said that my wife is not home now. Can I still come in? Yes you can . She came inside, took her jacket Off and sat on the couch. We talked about their dispute and who was right and wrong. While talking she began to come closer and then I tried to move away. Are you scared of me ? No, I said. So why do you move away. She came even closer and started to touch my leg. I was scared that my wife could come in at any moment. We both know that I am not really here because of the dispute, she said. I responded: you Are not ? Fuck my sis. I am here for revenge. She started to Kiss me and I couldnt move away because the Kiss was too good and in that Moment I felt that I did something good. We went into our bedroom and I fucked my Sister-in-law in my and wifes bed. Before my wife came home she left. When my wife arrived she noticed that I was nervous but still this day doesnt know what I did