[M4A] Hearing mommy having sex

I've heard my mom having sex with different men over the years in our small 2 bedroom home with thin walls. My small penis gets hard listening to the sounds. Sometimes I stand by her door and then go back to my room to jerk off like a good boy, or just stay in my room to do it. She has been with a guy for about a year now who makes her scream and he visits a couple times a week. Some nights are louder than others. I still live with her.

She dated when single and had some boyfriends over the years. I didn't know my dad and she raised me on her own, a proud white trash type. I am a passive beta type guy with a small penis but I do not hate myself or anything.

I think she looks pretty but don't want to do anything with her. I often think about what it would be like to watch and have been told it would be good for me. Could be exciting. What do you think? The humiliation part makes my small penis hard. Please do not ask for pics.

I am 20 in the USA.