Responses
the guy is already into bdsm (look at the dream he has in the first chap). the girl tho, i believe she gets more and more into bdsm as the story goes on
i think that's because he saw the stuff in the bag when he wanted to give the chocolates (which he thought was her crushes)
he's imagining that she is into it and that she'll do those things to him but in fact they're both vanilla
I don't know if this is the official translation but I read the webtoon on lezhin and from what I understood they are both vanilla but pretending they're into bdsm because they like each other. This is not a spoil but the bag was the other girl's one
I saw a lot of comment who are confused so here you are :)