Actually I don't know if I want this translated anymore after rereading this chapter. I can see it now, imagine she gets all romantic with her brother and they do some lovey dovey shit, but then she blue balls him and says some shit like " I only see you as a sibling and I don't wanna go out with you" and the brothers gonna be fine with it cause she's probably gonna say some shit to like mentally manipulate him into feeling as though he got ahead of himself or something like that. Cut through a few more chapters of certain "situations" between then happening later, he's walking home and then BOOM, he see's her walking into a love hotel with another guy and then she shows up to the house with her clothes all messy and shit. He cant say anything cause he's not even actually going out with her and it's probably gonna hit him in the pshyce. That's when the drama and maybe even pshycological shit starts.
I know this was extra as hell but, seeing as how she seems to be the school slut and her attitude, I definitely feel like massive amounts of drama and NTR are gonna be coming later on, it just feels inevitable.
Or maybe I just can't trust romance manga anymore after seeing so many fucked up ones that started wholesome looking and took a turn for the absolute worst.