I’ve always had a little thing for my mother-in-law. It took an ugly turn other night. Everyone had gone to bed, and I was up watching TV. I was very horny, but my intentions were to go and be with my wife in a bit. My mother-in-law came into the living room and decided to sit down next to me on couch which I definitely didn't expect. We've never really gotten along; we live on two different planets. I then had a few thoughts about her, sexual thoughts, and dismissed them. We started talking about working out and then stretched a bit in the room. I was turned on again, sexually. We sat back down and after a while she said, "I'm going to bed." I thought she had disappeared for the evening and started pleasuring myself on the couch. About five minutes later, she came back out. I honestly thought she wanted me to do something like, "make a move." She went in our laundry room and I remembered that once before, I caught a similar vibe years ago in her laundry room at her house. Well, I went in and started to talk, but not with any intentions other than to check out her vibe. She had an allergic reaction the week before and I asked her about it. She said she had a little rash, mainly just a bruise on her wrist from a hospital stay. I took her hand; I believe she was putting off some estrogen at this point. I grew instantly aroused when I held her hand. It makes me sick now. I let go of her hand and she said she had a little rash on her back. She lifted the back of her shirt and I immediately touched her back. This was very strange because we have barely hugged in the past. I began going up and down her spine and she said in a soft voice, "What are you doing? Oh, you’re rubbing my spine." Being the idiot I am, I took that for a go ahead. I stood behind her and started rubbing her back and she said, "What are you doing?" just like the last time. I stopped rubbing and stood off to one side of her. She said, "You’re making me feel uncomfortable." I said, “Sorry, let me just rub your back." She was clenched up a bit, but didn't say, “Don’t,” or anything like it, so I slid my hand down the back of her pants and grabbed her right cheek. She pulled away, said my name, and said, "it’s time for bed." I knew I made a horrible decision. I stayed up pacing and smoking cigarettes for about an hour, and then I decided to go and apologize. I knocked on her door, went in, and let her know I never did anything like this before. I was almost crying, but I think that just managed to freak her out. I'm sorry for being so stupid and dumb.