Ah yes, teasing NTR when she clearly meant to call her boyfriend. Now you're making him look like an ever bigger piece of shit than usual, and since when can't you tell who the fuck someone is just because you're drunk
I love this manga and anime, but this sudden "twist" seems really unnecessary, it's pretty obvious who is on who's side, and it's gonna take a couple chapters of nonsense for them to "figure" it out.