But do we really wish on Nanao a girlfriend who will cheat on her with all the whores in Tokyo?
Why do you think Asumi is doing that? Because she's too horny? Or because she wants to meet mai once again? You're writing like Asumi will continue doing that even after getting a girlfriend either mai or Nanao
I mean realistically she's just horny, there are more practical ways of meeting Mai if you were trying to be efficient about it
I think she'd struggle to give up prostitutes if she was asked to
The ultimate solution for Asumi is to just join the brothel as a call girl herself. That way she can instantly meet Mai AND continue having sex with a bunch of women to feed her horniness.
Also, instead of breaking her bank every time she has sex, she can get paid for it if she does that
You know, the difference between visiting and joining the brothel here is, Asumi wants to have sex with beautiful girls. Although Asumi, Senpai, Nanao-chan are all beautiful girls that's simply because they are the heroines. You still can tell most brothel customers are just very average women from the customers in the Lesbian Bar. That is very realistic. Also, that's why the call girls all really like Asumi, since she's very beautiful and cute.
That being said, if I'm the author I will end in 2 ways:
1. Asumi's final lover(s) accepted her hobby. Both Mai and Nanao still love her knowing (part of)Asumi's secret. So I think that's very likely.
2. Her lover fucks her so hard every day that Asumi is fully satisfied everyday so she don't need the brothel anymore. I think Asumi going out with both Nanao and Mai makes more sense in this case.