This happened 7 years ago when I was 12 and my mom was 38. Me, my 2 younger brothers, and my mom and stepfather went on vacation that year to my stepfather's one room cabin. We were going to be there for a week. Five days in and everything was going great, we went hiking, swimming, etc. and we went back to the cabin at night to sleep. Everybody else went to sleep pretty soon after except me. I had a little lamp and I read a book for about 45 minutes. Eventually I got tired so I turned off the lamp. I tried to go to sleep but it's hard for me sometimes. I tried to sleep for about 15 minutes, but I was still wide awake. Then I started hearing some noise from across the room. I heard some blankets rustling and I started hearing some muffled moans. I began to figure out what the noises were, even though it was hard to wrap my head around, it was my mom masturbating.

She must not have been able to sleep either, so when she saw me turn off my lamp she waited until she thought I was asleep and started flicking her bean. I started feeling sick and my heart started pounding, but not only that my dick got hard. You have to imagine I was a 12 year old who had just recently discovered masturbation, and hadn't had a chance to masturbate this whole trip, so when I heard a woman pleasuring herself I couldn't help but jerk off, even if it was my own mother. I started jerking off as discreetly as possible, terrified my mom would find out I was masturbating to her. I mean this was a small cabin, our beds were only about 15 feet apart ( 5 meters).I did not need to be afraid though, she was so enraptured in pleasuring herself I might as well have been 1000 miles away. My mother had started off quietly moaning every so often, but after a few minutes the rustling blankets got faster and she started moaning more often and shallower rising in a crescendo until she gave her first full moan telling me she was cumming. She tried to stifle it as much as possible so to not wake up her children, but unbeknownst to her I  was not only wide awake,  but actively getting sexual pleasure. When she started really moaning that is when I came. It was the hardest I had ever cum up to that point and the most semen I had ever produced to that point. My shorts were soaked and my groin and thighs covered in my own cum. It's a good thing my mom was also too busy orgasming or else she would have heard my own gasps as I shot cum every where.

After we both orgasmed my mother was able to peacefully go to sleep, while I had to face what I had just done. I had masturbated to MY OWN MOTHER! It was wrong and I felt sick and started quietly crying. The feeling of wanting to vomit slowly started to mix with another emotion, anger at my slut mom. I wanted to jump out of bed and berate my mother "How could you do that you whore?!?! How could you masturbate in front of your own son?!?!". And while in my imagination I was screaming this at my slut mom making her feel all the pain she had made me feel, in real life I was too much of an embarrassed pussy to do anything but wallow in self pity feeling sick, angry, and although I tried to ignore it, horny... Yes, I had watched some porn, but this was the first time I had ever heard a woman orgasm in real life, and even if it was my own mother it turned me on like nothing had before that. I masturbated two more times to the memory of my mom satisfying herself before I was able to go to sleep that night.

The next morning I felt bad of course, and my mom could tell something was off so she asked "Are you okay sweetie?" I couldn't tell her what had happened so I lied and said everything was fine. But things were never the same after that. From then on I viewed my mother in a sexual way and I wanted her. That day we went swimming and afterwards she hung her bikini outside to dry. That night after everyone went to sleep I snuck outside and came in her bikini right where her pussy would be. Again I felt sick but the next day when I saw her wearing her bikini I got a huge hard on. Seeing my mom in her cum soaked bikini gave me a very naughty idea. I said I didn't want to go swimming so I could stay behind at the cabin. So while everyone else was having fun swimming I was having fun of a different sort.  I started going through her clothes, and since this was the last day we would be on vacation all her panties were dirty and they were mostly thongs. I started sniffing them and jerking off getting high off the smell of my mom's pussy and ass.  I knew they could come back at any moment  and the adrenaline rush made everything even hotter, but eventually I got too nervous so I put all her underwear back except my favorite thong which I kept as a trophy.

We went back home that day and I jerked off with my mother's thong that night. I came on that thong so much it became completely hardened by cum. Eventually I started stealing more of her panties and jerking off with them, but they became less and less gratifying. I didn't only want to jerk off to my mom, I wanted to fuck my mom. I knew I could never do this, so I started fantasizing about other men fucking my mom. Fantasies of my friends, the neighbors, and even just random men gang banging my mother, became my go to jerk off materiel. That is how I got into this fetish. And now just jerking off to it isn't enough. I want other men to jerk off to my slut mother. I want other men to know what an absolute whore my mother is, so I am sharing this story with you now. I hope you enjoyed it. Feel free to talk dirty about my mother and tell me how you jerked off to her. I would love nothing more.

If you enjoy the humiliation, I think you should tell her anyway. Regardless of what her reaction might be, it'll be humiliating. Also, who knows, maybe she will understand and start letting you watch her getting fucked 

It really says a lot about how powerful our mothers are. She is probably completely unaware of the damage she has caused, she had forgotten about that quick masturbation session the next morning, but you, her son, will be stuck in that cabin for the rest of your life. She cucked your for life.

Wow a great analysis Crazy_Plankton, that kind of does sum up why this sick fetish turns me on so much. It also sums up some feelings I have towards my mother. Now that I am 18 I understand that all women, even our mothers, have sexual urges that must be fulfilled. I have no problem with my mom masturbating or getting fucked, if that makes her happy, that is great. What I am angry about is she masturbated while her children were literally only feet away from her. If she really had to orgasm, then she could have easily gone outside to the car and masturbated and I would have never been the wiser. But she choose to be a lazy whore and masturbate next to her 12 year old son instead of being mildly inconvenienced.  She thought none of her kids were awake, but didn't the thought cross her mind that maybe, just maybe I wasn't asleep? Or that her sexy moans of pleasure could have woken me up? Either that thought did not cross her mind or her horniness took precedence over the well being of her children. For her it was 5 minutes of pleasure, for me it will be a life time of shame and longing for my mother.