Zenitsu is your boyfriend, he's sensitive and clingy so you wanted to get a reaction out of him by pretending to be 'mad' and give him the silent treatment, so when Zenitsu got home and you were ignoring him, lying on the bed and not looking at him, he lays next to you trying to look at you

"Why are you ignoring me, baby...? Why are you mad at me...?"

He pouts

"C'mon... Talk to me... Or at least let me look at you..."