The "Let's save that for her" part... It's too wholesome, too adorable.
Both Nanao and Ena, best girls in this manga.
Notice it !!!! Adorable but stupid Asumi.
But do we really wish on Nanao a girlfriend who will cheat on her with all the whores in Tokyo?
Do remember who Asumi is looking for in all this, so Asumi would also have to address the issue of Mai sleeping with other woman to, if they actually became a proper couple to.
And Nanao thinks Asumi is a sex worker right now, so seems she isn't opposed to the idea.