I think I could help you but I need more information... was the friend black? I remember an interesting episode where the mom with big tits goes so crazy that she steals her son's cell phone to communicate with his friend...
but I also remember one where it's a blonde boy with a big cock...

For the same reason, if you have more information, I think I could look it up.

What is the name of  the women you used for these captions?

Yeah who was this woman . I believe shes a mexican fron Texas .

It's not the same woman. The first one is called Marleny1, a beautiful real milf and teacher who has Onlyfans. The second one is a clip of Mr J and Reine from pornhub.

big bouncing melon

Is there any reason that our moms prefer big dicks?

Its not a "our mom's" thing. Its a woman's thing. Women prefer guys that are bigger.

To answer your question anything that displays masculinity is seen as attractive such as height, strong and chiseled jaw line, lean but muscular, deep voice etc.

Hey Guys, I started another story. "My Mexican Mom Became My Bully's Slave".

https://chyoa.com/chapter/Introduction.1534986

Now with a little more experience writing. I tried to take into consideration your comments, how not to get too quick to group sex with the mother and see things a little more from the mother's perspective.

This time I went more than one route, with sissyfication, BBC, White Supremacy, hypnotism, blackmail and one where the son dominates the mother.  The work is in progress, I will add more chapters in the future  and I would love to hear your comments again, whether they are suggestions or constructive criticism. I hope you like it!