This idea has an overall romantic, frothy tone, even though there are several aspects of emotional conflict.
At the center of the story are two lesbian lovers, one of whom is in her mid thirties (let's call her Ava for now) and the other (Breanne, for now) is in her mid twenties. They have been happily married for five years now, and live with Ava's son Chris who is now sixteen. Ava had made it clear to Chris's biological father, Dave, that she didn't want to continue their brief relationship after Dave, a talented guitarist, had taken to drinking when Chris was only two. Dave had also realized that Ava was a closeted lesbian, and had moved away from the family. But now, after reading online about Chris excelling at the sport in his college, Dave wants to train him, as a way to repent for his earlier sins. And so he visits the two ladies.
The story is about how Ava and Dave rediscover their love, and how Breanne and Chris fall in love and lust with each other (on the sly from the other two, of course). Despite everything though, the central relationship remains strong and full of love.
Need two ladies who have experience playing lesbian characters for this story. They can change Ava's and Breanne's characters (and names) as per their choice, and can help shape the characters of Chris and Dave (both to be played by me). Willing to make changes to the story beats based on feedback from the partners.
Please PM me if the idea interests you.