And it's very good, I saw that you have permission to play version 9a, I took a look there, now it's 9b, the good thing about RenPy is that it's easy to translate, if I hadn't seen it in the list of translated games I wouldn't have known about this one game.
This idea is the ideal way a variable for the fetish the behavior will increase according to the value of the variable.
Like the scene at the bar with the first meeting between Ann and MC and Chris, I don't think Chris asking MC is a natural way, it could be done in a way where he flirts with Ann but doesn't realize it because she's shy and not loud good image, depending on the MC's stance he can be more dominant or more sub, and in the private conversation between the MC and Ann he can encourage her to take it as a joke and flirt back, as he understands Chris' behavior that Ann is very pretty and likes the attitude of not reciprocating Chris's flirting and will cut off the flirting, if the MC encourages the flirting it escalates when he comes to bring the drink if after Chris leaves the MC encourages Ann gives the phone number and enters the shared gift route or sub, if the MC doesn't encourage, but is very submissive and has little love from Ann, she secretly passes the phone to Chris, if without love Ann gives the number and enters the "Ann Hate route", Now MC is gift and love she doesn't Get on the phone and if you have love, she already has the one she wants to be with, opening the romance route.
On the cuckold route, at the bar on Joe's birthday, Chris comes to talk and talks in Ann's ear, Joe comes to talk and Ann says she's going to the bathroom, runs to Chris's car, she returns Mc notices a stain on the corner of her mouth and comments , Ann licks her lips and responds that Chris gave her a very good drink, Mc asks, can you go now since she's already back from the bathroom, she gives him a French kiss and thanks her because I ended up forgetting to go to the bathroom.