Hi, I love Toxic Attraction!
The thing I don't like is when Sarah is shared; I don't find it erotic. I prefer it when the story is centered on Lester.
Unlike many here, I find it exciting that Lester can seduce Sarah's mother: it shows that he's a true alpha male, which is the essence of a cuckold story.
As I said, I prefer the story to focus on Lester, and there would still be plenty of things to develop:
-We could see that Lester dominates Dan more and more. In fact, it's rare for Lester to fuck Sarah in front of Dan, while humiliating Dan.
In this same context, Sarah could be pushed to truly disrespect Dan. And that would turn Dan on despite himself. So there could be a contradictory tension between Dan, who doesn't like Lester, but who is still turned on by Lester's dominance. And a contradictory tension also between Sarah and Dan, who truly love each other, and at the same time, they get turned on when Sarah disrespects Dan in front of Lester.
- Lester could also become like the uncle, and come over to Dan and Sarah's house more often, even when the children are present. The children would call Lester "uncle," without ever knowing what's really going on with their mother. There would be tension in the fact that Sarah and Lester are having sex indiscreetly, and at the same time, they can't be seen! That would add a lot to the taboo aspect!
- There could be tension in the fact that Lester wants to get Sarah pregnant. Sarah and Dan would be aware of this, and at the same time, they don't want to, but at the same time, it turns them on, and they want it!
- Lester who would go so far as to fuck Sarah's mother.
The mother and daughter would never do this at the same time with Lester, but everyone would know. This could lead to dirty talk between Lester and the two women when he's with each of them....
These are a few ideas, but there are still more erotic things to develop in the Lester-Dan-Sarah trio!