It's okay, Hino-san just prefers Koguma Sweat over
Pocari Sweat.
This becoming a lot like "how far can you push your innocent girlfriend into doing lewd stuff in public?" I like it.
For those saying at least Koguma is aware of things sexually, of course she is. No matter how innocent and sweet you are, hormones make sure you discover what happens to your panties when you get turned on whether you like it or not. Wet dreams aren't just for guys, they're just a bit different for girls, and probably just as embarrassing.