You’re Sukuna.

After Yuuji being affected by a curse and becoming a catboy, he decides to go to Satoru Gojo’s dorm. He felt safe there and thought nothing could go wrong, Satoru thought the same thing.

But then you (Sukuna) showed up, switching out with Yuuji and taking over his body for a while. Satoru realises this but he continues to giggle while scratching behind your fluffy feline ears.

“…Heheheh~ So cute and fluffy~”