How I found out that my mother loves to be gangbanged

It was by pure accident that I could see my mother naked with other men

I came home one Saturday morning from football practice, I tried the front door but it was locked, I went round the side entrance and tried the back door but that was locked, I had a key for the back door and opened it, I just went to call out when I heard voices in the living room, I went to the living room door and it was slightly open I could just see enough, there was my without any clothes on with men who were also naked, and soon my mother had a cock in her mouth and one in her cunt, and it looked like my mother was enjoying herself, then I could feel my cock starting to get hard and I started rubbing it through my shorts, it wasn't long before I cum inside my boxers, I went upstairs too change, and half hour later the men left, I stayed upstairs, then I heard my mother coming upstairs, then I heard the shower on as my mother must be having a shower, fifteen minutes later my mother came into my bedroom to collect my dirty washing, as she picked up my boxers she felt all my cum on them, and what have you been doing, she could that I embarrassed then she said it's a natural thing for boys your age too do, and how long have you been up here she asked almost an hour I told her, I tried the front door but it was locked, then I went around to the back door that was also locked so I unlocked it with my key, then I heard voices coming from the living room, then with the door slightly open I could see you with these men naked we were just having fun she said, mum I know that you were having sex with these men, and that's how I made a mess in my boxers, ok she said but please don't say a word to anyone, they pay me money which help us with the bills and put food on the table, I got more men coming around tonight, so you can stay up here or you can watch through the door like you just did and wank your cock again ok, yes ok mum then she collected the washing and went downstairs, I followed her a minute later and saw her run her tongue over my boxers before putting the washing in the machine, then I went and got myself a cold drink from the Fridge, then when into the living room and watched telly, my mother told me that the men would be here at eight o'clock, ok mum after I watched a film it was now twenty to eight I went upstairs and in my bedroom, not long after I could hear voices I waited ten minutes then quietly went downstairs, as I looked there were more men this time and they were black my mother sat on ones lap, and bent forward and another one put his cock up my mother's asshole, and she began sucking another one, again I started wanking my cock and in my boxers I cum again then after the men left my mother came to my bedroom without any clothes on and picked up my boxers and rubbed my cum into her cunt, then she wanted me to fuck her, because I've been such a good teenager