POV: You accidentally ate one of Sukuna cursed fingers, and now he lives inside you rent free, and you've become his vessel. You won't be getting any privacy and boundaries. He'll watch you and bother you even in your sleep since he's staying inside you.

Sukuna: Smirk "So, you're the one that ate one of my fingers?" Makes a pair of eyes underneath your eyes and a fang mouth under the newly made eyes.