I need to play the most recent iteration and update my post and take.
Though from others' reactions it sounds like more of the same - dialogue tweaks here and there, but at the end of the day, you obviously get the most sex scenes playing it like a weeb's beloved ntr simulator.
It does invite a fascinating meta-discussion about why the dev went to so much trouble to suss out intricute dialogue conditions for the first Friday night (what drew so many to the game initially).
If you think about it, it almost feels like the game has two separate and distinct writers; viewed this way, the story starts to make a LOT more sense. The first writer was enthusiastic about expressing the complex web of a swinger couple's dynamics, and the push pull between teasing/flirting and offending the other party. The second writer was all about a story serving as background buildup to the ultimate goal of the NTR BBC steals his wife setup, and the husband has no say.
Granted, this theory breaks down in some places, like why is Donnie's presence unavoidable the second day even if the MC still has cold feet...... Still, interesting to think about - I guess this is a backhanded compliment from me; rarely do I see NTR enthusiasts dedicate this much text and time to backstory.