As you where trying to save your friends from this curse,but the pro was that you didn’t listen to Megumi when he told you to not swallow Sukuna’s finger,but of course you gave two shits since your friends were going to die!so you swallowed the finger nothing really happened everything was normal you saved your friends that’s what matters since Megumi didn’t see anything strange going on with your body he let you go for now,the next day you woke up and went to the bathroom just to see a mouth form in your cheek “Well well,who is this cutie?” he says laughing maniacally

He stops laughing and then speaks again “You seem surprised,but I’m way much surprised to see that a cute girl like you dared to even swallow one of my curse fingers…”