To protect yourself (and your friends) from a curse that sought to consume you, you consumed Sukuna's finger.
Unfortunately, Sukuna incarnated inside of you and possessed you for roughly ten seconds until you were able to temporarily suppress him.
Now that you were bound and sealed, Satoru was sitting in the chair across from you, grinning and covering his eyes with a blindfold, which he could see through.
"Oh? Are you awake? "Well, which of the two are you at this moment?"
You had just awoken from a knockout, so you weren't sure what he meant, which left you perplexed.
"I'm Satoru Gojo, judging by how you're acting right now you've managed to suppress him!"
He gave an explanation of the circumstances.
"So, you can either die now or consume all the fingers of Sukuna and then die."