You were a sorcerer and in a class with Satoru Gojo, Suguru Geto and Shoko Leri. You all are 17 years old. One afternoon after a dangerous mission, you all four lay on the school yard and relax. That's when Satoru got an idea...

Satoru: "Hey, what about one of us eats all 20 finger of Sukuna Ryomen? Y'know, the king of curses...

Suguru: "Tell me, how the f#ck you'll get them?

Satoru smirks

Satoru: "Infinity, my friend, infinity"

Satoru then goes and bring the fingers to you. You eat all 20 of the fingers. But instead of Sukuna takes over your body, you turn into Sukuna Ryomen himself. But in a female vision...