I was also wondering this. The game mentions if we don't make a deal then she will be mad at us or something, but so far I could only trigger scenes when making a deal.
For the future I think I'd be good if losing in combat/ going to the brothel/ whatever, increased characters corruption. That way the camp scenes could still happen but without MC having made a deal.
This part I already redesigned. There is 2 route right now I already in progress of developing as of now. One is netorase, which you can see most of the camp scenes and provided if the character have high corruption, the MC can join in the fun.
The other one is, you fight with Sayako instead of a deal. But you lose the fight, because of story reason. Which is the pure netorare part.
So I'm kinda finding a way if the player forgot to do the deal or no for the companion quest, I should give the player the choice instead of having a hassle going to her house just to talk to her. Since, it's a companion quest.
Because that part I design, I was trying to make it too sandboxy which is making the game all messed up and no flow. So I tried to do a real flow. I got too over ambitious.