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Sorry for my poor English

Sui-chan lol

Merry Christmas

Maybe it's just me but I don't think MC intended to stalk Maron. I just realized that almost everything is written/drawn from her perspective of view. And to get information for the readers, she more or less has to be following her, or else we only get to see what MC sees herself. In a way it's stalking, in another way it's just the perspective of view.
But I don't know, that's how I see it.

Even in Nico's dreams she's a tachi.

Isn't tachi supposed to be the Top while Neko is the Bottom?

Correct