I think it's too late about that. If we're going from the colored pages which are probably a bit in the future, Ayu sees Hii and the teacher kissing.
Am I the only one who thinks the mangaka might be messing with us? That scene is certainly made to look like a kiss, to certainly be something that gives both us and the MC the impression of a kiss. But it's a bad view . . . worse for us because we can't see the contact point past the MC's head. But it strikes me as one of those things that could be angle--like their faces are very close but the impression of contact could be false.
I'm sorry to blow up your theory but this page http://dynasty-scans.com/chapters/sentimental_dust_ch01#17 is obviously jealousy because at this point they are already dating. This is not done to protect her or anything because they are quite close.
if this was real life. i would never, under any circumstance, let the person im dating, sleep in the same room with their ex. never.
however, this is a comic. so, im sure pmew wont cheat. :) and donut wont sleep
Same.
I'd give Ploy a room for herself, while I'd sleep with my cute Donut.
Cant wait for the next chapter.