It's not something that was supposed to happen believe me. My mother-in-law isn't hot, she isn't sexy, doesn't have a huge rack or a big ol booty. This happened with my ex-wife's mother-in-law. For about 2 years after we first got together we lived at her parents house. I was working construction but it was the winter so I only worked two or three days out of the week. My wife was working at the mall second shift so we would hang out in the mornings but she would leave to go to work around noon and come back around 10 p.m. My father-in-law also worked second shift but slept in a room in the basement, he rarely came up only to eat breakfast or to chat with everyone for a while. Not sure what was up with that relationship and my wife didn't talk much about it. Something told me that he got caught cheating and so that basically he was living there while in the dog house so to speak.
Well anyway, let's get to the point. It was December and I have been chilling around the house watching TV, grabbing something to eat, working on the computer or doing whatever I could to keep myself occupied. One day after my wife left to go to work I decided to take a nice long hot shower. As I was getting dressed I realized I forgot to bring some underwear so I just threw on my shorts and a t-shirt. I don't usually walk around free-balling but it felt nice and decided to just stay as I was. After a while I sat on the couch and started watching TV as my mother-in-law sat down and watched with me. Before long I nodded off, I don't remember what I was thinking about or dreaming about but somewhere in my dreams something good was happening and I start getting a hard-on. I'm sure I was out in dreamland for about an hour and when I started to wake up I realized I had a huge tent in my shorts. I didn't panic or bring additional attention to myself. I just shifted and push my cock over into my short leg and against my thigh. I looked straight at the TV and pretending like nothing happened. But at the same time I would turn my eyes over to the right to look and see if my mother-in-law had noticed what happened.