This is actually a somewhat old series of events, back from when I lived with my parents. Didn't move out until I was around 23-ish? The whole thing started when my mom barged in literally seconds after I had finished jerking off. I had just closed the browser tab, I had a huge load of cum all over myself, and mom just walks in and asks me about my weekend plans. I threw a jacket over myself, but she had a good few seconds where she saw my erection and load. Thankfully, we were both super chill about it, no one freaked out. We even carried on a (somewhat awkward) conversation for a bit. She left, closed the door, and I was already hard again. Knowing my mom had seen me like that was SUCH a turn on.

However, that made me realize that if mom didn't mind, I could indulge in my exhibitionist kink a bit. By the end of the week I just started jerking off with the door open, usually after I went to bed. Mom was completely fine with it, so I kept on doing it for a few years until I moved out. I'd go to bed, pull down the sheets, and start stroking it. Was so turned on I didn't even look at porn or anything. Of course, she wouldn't see me every time, but maybe a few times a month, the stars would align, and she'd stroll by my room while I had the door open, with my erection in my hand. She never said anything, but a few times she stopped for a moment, and whew, when I knew she had stopped to watch, I usually blew my load within a second. This was (nearly) every night for around 4-ish years, so you can do the math on how often mom saw me pleasuring myself. I tried to be subtle, only left the door open about halfway, didn't moan loudly, anything like that. Was SO hot, just knowing she had seen my erection. Always wished she did more, but alas, never happened (or at least never happened directly, I still got to see a few things, but that's a separate story). I still visit for holidays and such, but haven't worked up the courage to maybe jerk off where she could see me again.