I honestly want her to end up with Nanao at this point she's so adorable.
Nanao wants to be her girlfriend, but I think Asumi is too deep and will never be a monogamist anymore.
Okay hear me out: imagine Nao discovers the brothel service Asumi is using, and she decides to try it out to see why Asumi likes it so much, and then boom, her first sex worker is Mai.
Cue sexual hijinks and set up for a thruple end game