Guys she was just kidding. She does have an NTR kink but won't actually commit to it. For now. And that's just the author going around their own kinks lul.
Having said that, that stuff she did in front of the whole class... That's going overboard. She was essentially forcing him into unconsensual foreplay. It's more stupid that no one in the class seemed to realize that, but again the whole puting panties without anyone realizing it's pretty stupid in itself.