Props to Karin. Mei's indecisiveness should get more of the girls to explore each other. Karin can't stop being best girl for me.
That's lame and defeats the point of the manga. Why have the girls date each other when the point of the manga is they are attracted to Mei because of one of the 5 senses. If any character activates that attraction than the manga's entire plot is thrown out
I personally like it when characters in media have more dimensions and are capable of being attracted to more than one person. I'm not one to focus on realism generally speaking, but that's how life works. They're a group of lesbian women that are sexually expressive and open. Having characters purely revolve around the MC tends to feel shallow with most any media, so I'm glad that the girls are interacting with each other and have more to do outside of the MC.
So I don't think it defeats the premise of the series, especially if the MC dates only one of the women in this group, I want the others to find happiness and their own partners. If they all end up together I want them to be able to enjoy each other's company as a group.
Ultimately one of those things I'm pretty sure we're going have to simply agree to disagree on though. Which is fine, and I'm mostly here for the ride of seeing where the author takes everything.