Responses
The hypnosis could have included both getting cleaned up and going back to their own apartments. As for his butt, the hypnosis might have included not thinking about why it feels strange.
Omg, the hypnosis can be this full of details? Idk if this could happen in real life (I mean, brainwashing/hypnosis/mental manipulation, etc), but that could be the case if the author decides to do so in her story, so yeah, you might be right, thanks for explaining!
Wtf happened after they fuck? I mean the sunbae and the other guy, they just forgot they had sex? But how that even happened? Didn't they just woke up naked next to each other? And even if they thought they didn't have sex, like, c'mon, sunbae's butt knows the true, so why is he pretending nothing happened? What is happening here? Why am I reading this? Pls someone send help Σ(っ°Д °;)っ