@SuperOniichan
I don't understand how this is problematic in any way. Hiyama clarifies everything on the last page.
She is threatening her to use her picture as a screensaver, and to print it out as a poster for her room. Just weird, and in this context funny.
The joke is that Hiyama has no self-awareness about how threatening and terrifying she is from MCs point of view.
Which is literally a common trope for mangas and anime.
Ryūji Takasu from Toradora and Kodaka from Rinjin-bu have the same trope, they are guys who are viewed as dangerous. They are more or less self-aware but nevertheless get in situations where they accidentally rob someone for example. Kodaka gets a girls phone number in a situation very similar to this one. Nobody cares and this was an anime.
But I hate it when they do this, while trying to be moralistic snowflakes and saying that things like another stupid ecchi harem or sexy comedy are sexist
You are wasting your time caring about this stuff.