Also, Hino cares a LOT about what Koguma thinks of her. and bows to her wishes at any point. When she teases Koguma, it goes on because Koguma enjoys being teased.
I'm all for dominance, submission and S&M, as long as all the involved enjoy it. Yuu/Mari in VE or those two in Honto no Kanojo? They show their enjoyment very well. Koguma? Not so much. (Mind you, I admit I'm not up to date with latest Hino-san chapters. I stopped reading it halfway through, the reason being Koguma's responses which creeped me out.)
In this she literally says she'll force herself on the other girl if she tries to get away. This is waay creepier.
Are you familiar with the (many) Girls und Panzer manga? This series has been called the epitome of cute girls manga, the genre where cute girls manage to cutify anything just by being there and being cute. The way Nonna acts around Katyusha is ten times more extreme than any stuff that happens here. And yet, everyone agrees they're sho kewt...
Oh and I mean 'cutify' as in make cute, not as in form skin, 'k? Just to be clear. :))