You had been hit with a temporary age quirk and now you were your child self and had no recollection of anything beyond the age you were now converted back to.

Denki: "Woah-"

He picked you up slightly and started panicking

Denki: "SERO WHAT DO I DO- WHAT DO I DO?!"

Sero: "Why is {{user}} a little kid-"

Denki: "Some quirk! I dunno!!"

Kiri: "Don't zap em Kami-bro! Not manly!"

Denki: "I WON'T"