So she was with someone and needed to unwind? And she is embarrassed by what ever she did... It still smells like bait to be honest.
If I think it's all just bait, I'm 70% sure she didn't sleep with any man in that hotel. However, I'm pretty sure she probably has a fetish she's ashamed of and doesn't want the MC to know about. The truth is, that secret and that fetish could be anything, but I think it'll be related to the plot. She likes to masturbate, and maybe her fetish is that she enjoys being watched and watching someone else masturbate, but without sex.IMHO, this is a true "rom-com", not the fraud one as Grapara. So, the more the author turns it into a mystery, the more likely it is that misunderstandings will be. @box2024 and @Jhon1617 just need to let yourself feel the excitement the author intended. Once the mystery unravels, a sense of relief will follow. LOL