It works the same way it does with Josy -- depending on which of them MC spend more time, he'll get an outing with either Josy or Maya. If he hasn't looked at too many of other girls' asses, he gets option to tell Maya/Josy that he loves her, and if he's got enough relationship points with her, she'll reciprocate. Or keep silent if their relationship isn't high enough.
Man, this is what pisses me off the most about DPC. Why do this?
I paid extra attention to make sure I spend time with both of them equally and they even said so when the matter came up in conversation. So why do this now? Why must the game choose for me only one of them when I am in a relationship with both? It makes absolutely no sense for MC to say 'I love you' to one of them and not to the other if you are properly balancing things. You should be given an option to do so. If we want to later pursue a solo path, that's fine. But if we want to keep in the throuple path, then we should be given the option to say 'I love you' to both of them. Now I have Maya sad in the couch because I said it to Josy and didn't to her even though I want to, the game just didn't gave me a fucking option. This is some serious bullshit DPC is pulling. He is forcing us into a drama that we don't want.
The same is going on with Sage path. The game simply doesn't give you the scene where you say to Sage that you love her if you choose to go for a threesome with Camilla. Why? Why lose this precious development in their relationship just because you decided to have some sexy fun
with your girlfriend?. It makes no sense at all to me why those two scenes are mutually exclusive. They could very well have a small scene where they lay into Sage's bed and confess their feelings. Instead, we pretty much get a branching path
inside a branching path.