The New Years eve when I was 18, I spent it with my mom's family side (my parents divorced when I was younger) and it was the first year where I was allowed to drink alcohol with them to celebrate. Of course, they all proceeded to get me drunk.
It was alot of fun but since I didn't drink often at that time, I got drunk pretty easily and soon enough I got sleepy. This was happening at my grandparents house. There wasn't enough place for everyone to have a bed, so my mom and me had to share a bed. I said goodnight to everyone and headed to bed. I think I fell asleep pretty fast or I passed out drunk maybe, I'm not sure, things were hazy. I don't remember if I undressed myself first but that's irrelevant to the rest of my confession.
When I woke up later that night, I was spooning with my mom in bed. I was behind her, snuggled against her back, my arm was over her with my hand resting on her stomach. She was sleeping in a long t-shirt. I had only my boxers on.
I hugged her closer and tried to sleep again. Don't know where that came from but after a little while I got an erection. It was pressing hard against my boxers and it was a bit painful so I shifted a bit and just let the head poke through the hole of my boxers to relieve the pressure. There was no way that I was going to jerk off with my bed in the same bed, so I figured I'll just let my erection go away on its own.