That book has similar themes, but not quite the one I remember. (Remi is telling this to Patchouli, for some reason -- I don't think it was overly shippy, either. Hrm. I'll have to dig further.)
It's extremely difficult to see what's going on in a darkened room from outside where there are tons of lights creating reflections on the windows. Nobody would see them unless they actually pressed their faces up against the glass, and I doubt they're on the ground floor.
People's minds are irrelevant to the canon thankfully. Haru is actually quite nice and this relationship is wholesome.
Just stop drawing her with Yuu's hair color. Nakatani-sensei fixed it already.
How did I overlook this amazing artwork? How foolish of me.
Suave top Eri baiting Maina is about as likely as an idol fan getting with their fav idol.... ouch, I just hurt myself.