Takamine honestly is a bit flip-floppy and indecisive. Like I can get why people might be frustrated at Shirota for not getting that she likes him, but let's be clear here: she is a bit of a dick.
I mean, she basically told him "be my manservant or I'll ruin your entire life by making a false rape accusation" with the first few chapters, and that alone is enough for most people to have some...apprehensions about entering a relationship with a person.
But more than that, she's just generally very indicative, petty and has a habit of setting up ultimatums just to toy with him. From his perspective, and keeping in mind that she just kind forces herself upon him and wants him to go along with it, it's probably more safe to get the impression that she's plotting something or is trying to mess with him rather than her having genuine feelings for him.
I think that's an interesting aspect of her character in that her faults are probably what makes it so she's unintentionally sabotaging her own chances of a relationship because she has to go about indirectly setting up "games" instead of just saying how she feels, which I think/hope will come to bite her in the ass.
What I hope ultimately happens is that she's forced to reevaluate how she treated MC, such as MC falling for and/or dating another woman and she'll have to reconsider how she treated him and improve upon herself to get him back. I don't want how she's treating him poorly to go unaddressed because I feel like this is unfair to Shirota, as he definitely has undeniably been abused by her in the past, and will be in the future if she doesn't change her act.