You know, considering that she once pissed into the cup of his hands, oh which she seems to have forgotten about; him hearing her piss is the least of her worries.
I guess she's the type of woman who thinks women have to be "pure" and can't have lust. But every time she tries to restrain herself, it gets worse, which is why she's stuck in this hypocrisy of doing perverted things while calling the MC a pervert.
And yes lmao, kinda wild of her, she almost made the MC cum while she was riding on top of him, and didn't happen only because the big booba girl interrupted her.