So you just conveniently forgot the fact that the continuation of that scene plays out entirely differently in this new story compared to the old/fantia versions? She basically walks in and immediately gets the text from Tanuki which makes her leave before the fuccboi can even do anything.
The worst she did was get on her knees cause he pushed her down after handing her the bag, she never even so much as saw a pixel of his dick. If anything the fact that she's a virgin/"pure" and doesn't understand lewd stuff lends credence to the fact that she would blindly listen to him not knowing he was obviously asking for a hook up.
No, they're right, read that chapter again even if that page is enough. She's not a virgin. She used to let others take advantage of her but not anymore. This encounter was meant to show her growth.
Some similar scenes of what we can see in the NSFW versions still happened before this wholesome version started. But now, we're seeing live the same scenarios be resolved positively.
Her being embarassed this chapter doesn't negate all that and isn't meant to be a twist revealing her as a shy virgin all along. No, there's plenty of other reasons why even with her past, she'd be embarassed to talk about sexuality with a girl she just met, especially someone suspiciously close to her step bro.
Also, since she was clearly weak to pressure and just went along with whatever creeps wanted, it's more accurate to say lewd things were done to her. She had no concept or trust in her own agency, so weirdly enough she's still clueless about what normal and healtht sex and romance look like. So she can't talk about what she doesn't know, and she's ashamed to talk about the little she knows since it's not exactly a pleasant or her favorite topic of convo.
I know manga readers lose their shit when the FMC got laid but no need to be in denial, she totally let the dude from ch 12 and his buddies do things to her, but she'll be fine now and so are you.