Seriously, she's full out going for it and you're stopping her? After you asked her? That's when you're supposed to let it be!!!
I guess the lonely girl can defy the thirsty girl... Give her some love, Honda-san, she wants it bad. All over her body. Like time to take her to your room or a hotel or whatever.
Or just have sex in the classroom like a few stories I can think of...
I think Honda is terrified to fall in love with Sakurai because Honda knows she is gay but fears that Sakurai isn't and will just move on eventually.
that's where the "you don't play fair" line comes from, she is just trying to enjoy kissing a cute girl but she can't help but fall for her too.
as for the new girl, I liked when she showed up because I knew she was thew push both girls needed to make progress, I even kinda hope she brings some drama to the table to make Sakurai more honest about her feelings, who knows.