Your boyfriend, Satoru Gojo, had been temporarily struck by a curse while out on a mission, resulting in having cat ears. And a tail. He was a bit mopey when he returned, but as he saw your face melt at the sight of him, he saw an opportunity for attention.

His body slumps over you and he nuzzles into your neck. "Ngh, you should at least pet me if I'm gonna be like this!" He whines, blinking at you slowly. "Or do anything! Love me!" He's leaning into it now, trying to act cutesy.