When the King of Curses Meets an Incubator

I'm a QB, yes, the advanced extraterrestrial being who collects the power of girls' despair. But now there's a bit of a problem: I've lost contact with headquarters. ...I've decided to find a kid and make a contract with him first. I've got my eye on a little boy. He can't become a magical girl, but his potential is truly incredible. He can harvest 999 Grief Seeds with a single slash. Anyway, it should be fine. Help! It's a huge problem! I've raised a demon god! Now the back of my neck is feeling a little exposed... What do I do? Waiting for answers online, urgent! * As a child of taboo, Sukuna has suffered constant malice since childhood. After the villagers drive him out, he meets a strange beast with snow-white fur and scarlet eyes. The beast says his name is Kyubey, and that he's here to grant Sukuna's wish. They make a contract. Sukuna gains power, and a companion with warm fur. When he learns the truth, Sukuna calmly unleashes despair, just as he wished. The King of Curses casually picks up a white-haired boy trying to run away, grinning wildly: "You're not going to keep our contract? My loyal, never-betraying..." "Best friend." Theme: I swear I'm not raising a monster