Since this type of plot/theme (mom+son+his friend or cousin threesome) was for a long time one of my incest-theme fantasies, i've expressed my disappointing in how you decided to elaborate it, but at the end of the day, your story, your choice, obviously. Here's how i would have create/imagine it (just in case some artist is reading this and maybe want to give a shot on this subject) : 1) age more less as yours characters, mom37-45, son and friend/cousin...well, teens, let's say 18 or undefinite age, but they look like your characters (meaning, pretty big, adult cocks - right for the story) except hair color, i would change it for mom and son, no red hair 2) they are all aware and awake, conscious 3) they are either all at some kind of family gathering, or dinner, or party, or whatever, where they happen to have fun, dance, drink and stuff with mom, who's somehow preferring them to boring rest of the family and friends. 3) dance after another, joke and phrase after another, they make her laugh, and friend also manage to touch her few times, as well as "put a bug in son's ear" by constantly saying how hot his mom is 4) while her husband and rest of the family are pretty drunk, friend convince son to ask his mom to take them home, to play games or whatever 5) at home, instead, mom is keeping them company in son's room, and there, with maybe few more glasses of wine, and with help of either truth/dare game, or maybe watching hot videos, they first talk about sex, and step by step, friend manipulates son and mom to first undress, then kiss, then after some time of convincing , they - as if they all were teenagers after party - end up french kissing , then get naked, then boys both fuck her, with son becoming more and more dominant and getting the most part ( we see that main goal of friend/cousin was actually get mom and son to fuck, and therefore seeing incest firsthand). This is just one of potential basis for this type of story, it obviously could be different environment, or family situation, but more less it should be more-less realistic, actually possible taboo situation/plot/real life case. I would do it that way.