Caught my MIL cheating and watched
Last week, while my FIL was away, I didn't have a lot going on at work so I decided to leave the office, work remotely, and to see if my MIL wanted to get a drink with me that afternoon since it was really nice outside. I called and she didn't answer. I left her a voicemail and told her that I was on her way to pick her up. I just assumed she was working out or in the shower or something so I decided just to drive to her house.
I walked into the house and called out her name but she didn't answer. I assumed that she might be out for a walk or something since her car was in the garage. Then I saw her phone on the counter as I got further into the house and I was confused. I stood quietly and heard some muffled noises coming from the 2nd floor. I was afraid to call her name again so I crept up the stairs fearing what I was about to find. I noticed that my sister in law's old bedroom door was cracked so I went to the door and the noises I had previously heard were starting to get a little louder. I peeked in the door and I saw my MIL, on her knees, between someone else's legs. She was facing away from me, I had a clear view of her ass as she blowing this guy that I couldn't make out from where I was standing.
I instantly got hard but was super conflicted because I actually love my in-laws. I did not let my curiosity best me though, I watched from where I was standing for a couple more minutes before sneaking back down the stairs and out of the house.
Later, when my MIL returned my phone call, I told her I just assumed she was busy so when she didn't call me back, I just went directly to the bar. She paused for a second and then said, "Yeah, I left my phone when I ran to the store. I'm sorry I missed you." I just told her not to worry about it and that we'd catch up soon. She said, "No, I'm just freshening up, i'll meet you there. I'll call an uber and then you can give me a ride back home later." I wasn't thrilled about seeing my MIL so soon after catching her with another guy but I knew I needed to play cool.
That day taught me that it definitely wasn't the first time my MIL cheated on my FIL and that she was a lot more cunning than I ever could have imagined.
Really similar thing happened to me a few years back. My MIL was clearly cheating on my FIL. I was sitting at work and a text buzzed to my phone. It was my MIL. I opened it and it was a selfie of her, fresh out of the shower, towel barely draped over her tits and the text read "See you later.." I thought for a second and replied "I am either the wrong recipient OR you've made my afternoon. You tell me." My phone rang. She said, "You have to promise not to tell anyone! You have to!" I said, "I guess you should cancel your date and I'll see you in about a half hour." She stuttered and said, "Ok, see you." I pulled in the driveway, waved at the neighbors, walked in the house, and she was still there in the towel. She went to say something and I simply grabbed her, lifted her, carried her to the bedroom, dropped her on the bed and by that point, she was ready to go. I was in all three holes that day and came all over her tits too. We started fucking once or twice a week after that until about three months after her daughter and I broke up. Only reason we stopped is because I was offered a job out of town and I knew I needed a change of scenery. She was 24 years older than me and, without question, the best fuck I've ever had.
So I guess a blackmail blowjob not out of the question
If she is hot, confront her and demand some sex not to rat her out