What I’m expecting next chapter: Asumi lies to Nanao about having work that night so she can go to her reservation, Nanao gets suspicious and follows her, sees her heading into a hotel with another girl (if the girl’s butch enough she might assume it’s a man), but because Asumi said she had work Nao will assume that she’s the prostitute.
If she’s feeling really protective, she might even try to intervene then and there, though that would resolve the misunderstanding immediately so i doubt it.
If this isn't exactly what happens I'll be shocked. It just seems like the only possibility.
She's probably going to assume "that horrible boyfriend of hers is forcing her to do sex work", run home, then spend a handful of chapters agonizing over how to ask Asumi about it and/or feel jealous and oops, gay panic!
Oh my god, I just thought of something even better!
Nao will be torn between her desire to “save” Asumi from sexwork and her desire to have sex with her herself (I just know she’s going to fantasize a lot about Asumi “working”). She won’t have the courage to confront her about face to face, and she’ll think that Asumi will probably just deny it if she did, so (maybe with the assistance of Senpai), she’ll try going to the brothel to catch her in the act and “rescue” her (definitely not to have sex with her, honest). But she can obviously never find her, no matter how reservations she makes, Asumi doesn’t actually work there after all, so she ends up in the same situation as her, calling a new escort every weekend while trying to find the girl she loves. She’s in too deep to quit now.