I like Fujiwara but I prefer her with Shirotaki because she deserves better than a man who conflates her with his child brother. Her whole complex is about not being seen as a viable love interest, and Fujiwara is only reinforcing that while Shirotaki is actually into her and very upfront about it.
Poor girl though, if a hot guy I had a crush on kept touching me the way Fujiwara touches her, even if I had a boyfriend I'd be like ??? So I can't really fault her for that. She's literally a kid plus she hasn't thought a single unfaithful thought this chapter.