Here's a scenario I thought of after playing getting most of the endings
The MC and Cathryn clean up their apartment hiding any obvious evidence she's in a relationship so she can meet up with a guy at a bar and bring him back so they can fuck on the MCs and Cathryns bed (the MC is out of the apartment after they finish)
A few hours later Cathryns texts the MC "Shit we forgot to take down the picture of us at the amuesment park now he's looking around!"
The MC and Cathryn start panic texting eachother trying to figure out how to get her laid
The guy she found at the bar isn't into cucking so if they're found out or the MC fails to convince him he leaves
The bad end is the MC and Cathryn having boring vanilla sex
I thought this was a funny yet (kinda, sorta, not really?) wholesome scenario