Thought I'd share a couple of things that led me to this topic, All that I describe happened in Russia, year, city, my real name or the name of people I will not write, it is stupid and dangerous, My mom is let's just say quite a beautiful woman, she has had many lovers and men in the past, with my dad, they'd split up and get back together, there was a time when I had a stepdad.
I will write the sequence of events that led to this fetish and fantasy 
(I will try to write concisely and succinctly)
1) When I was 9 years old, I heard my mom moaning in the night, I thought she was in pain and scared and ran to her, I burst into her room and she was just getting on top of my stepdad, it was the first time I saw her being fucked by another man, I still remembered my dad and it was a huge shock
2)One day we were walking down the street, a man approached her, it turned out to be her ex (when she was younger), during the dialog they smiled and talked about life, he said in her ear "I will never forget your mouth" they laughed and walked away with me.
3)Once my mom was told about some kind of healing massage, she took me there too, the massage was done by a woman about 60-65 years old, the point was that you were rubbed with oil on the chest and circular movements supposedly treated for bronchitis, asthma, back pain and so on, the point was that you completely take off the top of your clothes, then I saw my mom's tits in all their glory for the first time, big breasts, and it was strange for me to see that her nipples started to stick out in the process, I was already wildly excited. But the most fucked up thing happened when the next day a boy appeared, her nephew maybe (I was around 11-12 years old), he was about the same, and she agreed and lay naked even though it was uncomfortable on her face. The boy didn't give her a massage but he could come over and ask the woman how to do it, it was the first time I experienced arousal so intense that my dick almost burst, my mother naked in front of my age and the woman who was giving her a massage.
About a month later I met this boy on the street, we said hello and parted as if nothing had happened, but he was smiling evilly
4)On vacation in Turkey, my mom got out of the pool, her breasts came out of her swimsuit, people could see the nipples, two old men were laughing and pointing at her, and the young guy next to me said, "wow, sexy," I was embarrassed, but I was excited
5)There was one nasty boy from a parallel class, he saw my mom when she came to school for a class meeting, she was wearing casual clothes that showed off her cleavage.
But all my horror was that he was friends with the guy who saw my mother naked, after a while this jerk started asking me with a grin when your mom would go for a massage, they told me about her and so on, I avoided him for a while, then when he said "Your mom has papillae stand when her breasts are crushed" I very much stuffed his face, then our parents were called, but of course I did not tell the reason for the fight, so I was the aggressor in the eyes of teachers and mother, he did not say anything more about my mother, The boy who was watching the massage was not aggressive and did not say anything in front of me, we just greeted each other, and nothing more. (rather, they discussed among themselves and he just said that he saw her naked)
6)My friend flirted with my mom, he constantly joked that my mom was a milf, but on his part it was not offensive, but rather funny, he had a feminine appearance, and he was bisexual, he even admitted once that he liked me, lol (I immediately said that this was not for I). Flirting consisted in the fact that he told her various compliments, for example, "This dress emphasizes your figure so much," she usually laughed and stroked his head)
7)My mom went to a fitness trainer, a guy of 20 years old, tall blond with blue eyes, there were rumors that he often fucks clients, and that he fucks well, my mom went to him for training, he constantly filmed her sexually for stories in insta, especially the buttocks while performing the movement, sometimes the cleavage, that it was especially hot, it was the fact that her nipples sometimes stuck out through the fabric, I do not know if there was sex between them or not, whether she cheated on her father and so on, but I fantasized about it
8)At graduation after the end of the official event, my mom went to dance with my classmate's father, he danced very gracefully, the man looked like an ordinary middle-aged man, but had charisma, then he brought my mom to my classmate and said "dance with this lady", and my classmate danced with my mom, stopped by her from behind to the waist, but the most erotic thing is when he was standing behind, and she raised her hands up, and he gently held his hands to her armpits, while her breasts were shaking very much, it was very hot in an evening dress
I'll write about other things later.

Exactly, this is why one of my impossible to obtain fantasies (of which I sadly have many) has always been to be able to reverse time and go back to being a lil kid again, but retain my adult physical strength, mind (as in having complete control of my emotions and shit), and cock size.
So I could play sweet and innocent, then fuck the absolute shit out of girls and their moms while their brain tries to make sense of how I can be fucking them better than their husband ever could, or.l why they can't overpower me. Then act like a sweet angel if anyone ever tried to accuse me of anything, or act like it never happened the next day, and gaslight them into thinking they're the freak for having such a vivid dirty fantasy about someone so young, sweet, and innocent 😂

Thanks!  This is the first time I've ever written about my experiences. 
I'm not too sure what her cup size is.  It was a significant increase though.  "Pornstar tits" Was a phrase I heard from the other boys a lot.

I'll delete this photo later, here you go