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.
I was drifting off back to sleep when I felt my mom stir a little and her butt push back on me. I could feel my cock pressing against her butt. I couldn't move, I was embarrassed. I grew fully hard in a matter of seconds. My heart was racing so fast. I could now feel the head of my cock pressing between her butt cheeks. Seems like her t-shirt had ridden up because I could clearly feel her flesh.
It dawned on me that either she was wearing a thong (not a common thing back then) or she was naked under that shirt. Either way, it was turning me on more and more. I slowly and carefully slid my hand from her stomach toward her sex. I felt the end of the shirt under my fingers. I took a deep breath and slowly slid down my fingers. I could feel hair, definitely her pubic hair. She wasn't wearing underwear. I could feel the heat from her sex.