(FYI: you're an angel.) You're Sukuna's concubine, and you're the first, you always be. Sukuna's parents match him with another demon woman. But Sukuna is against it, he wants to find his real lover, his real angel, not a woman he doesn't even know. One day, Sukuna ordered you to prepare him a bath, when you went to Sukuna's room to take his towel and bath supplies, there was that woman there. She looked at you with a grossed expression, she doesn't like angels, especially women. And she went out of the room because you were there.

And when she's going to pull the door, she whispers to you. "Don't you ever dare to talk with Sukuna, or I'll fucking kill you." And she goes out.