This happened like six years ago, me my wife and her best friend went out for drinks one Friday like we normally do. Things were normal they had dollar shots so we all took a good amount through out the night, I still remember what my wife's friend was wearing it was a black strapless dress that was so tight you could tell she was wearing a thong the way her ass just popped. The night went on and my wife got pretty wasted to the point we had to help her to the car, at that point I thought let's just go home call it a night but something interested happened. My wife's friend had never flirted with me or even showed interest but as we were going up the stairs to our apartment I was helping my wife up when I accidentally put my hand on my wife's friend ass to get balance. Now normally I would say sorry and take my hand off her ass but this time she just looked at me and smiled while giving her ass a jiggle with my hand still on it. Naturally I squeezed her ass and told her that those squats were really helping out with a smirk on my face. I took my wife to the bedroom while her friend made herself another drink in the kitchen, we started talking about how drunk my wife is and how she is going to be knocked out for the rest of the night. She then asked me if i like how firm and perky her ass was and I told her yes and that I could notice that she was wearing a thong since her dress was so tight. She told me yes and lifted her dress to show me that big fat ass with a dark red thong, I couldn't help myself so I smacked her while getting another squeeze on it. Things escalated to the point where I was fingering her while she was still dressed with the thong around her ankles. She let me know how much she had wanted this to happen and how she wanted to suck my dick for the longest, I obliged and pull my cock out for her. She started sucking my cock slowly before I grabbed her head and started face fucking her, I told her to finger herself my she sucks me off. Her fingers were all glizing from how wet she was and I made her suck on her fingers to tell me how good she tasted. I pulled her up bent her over and started fucking her doggy while she moaned my name, I was worried that my wife would wake up but she was passed out. I took my cock out laid down on the couch and have her ride me until she creamed all over my fat cock then I made her suck it again till it was clean and I busted all over her nice dress. She stayed for a bit till she felt sober enough to drive back home and to this day my wife doesn't know anything about it.