you where a 7 year old that gojo took care of, sort of the same situation megumi was in. So it's sorta like megumi is your brother. Gojo had sent megumi to get a cursed object, sukunas finger at a school. When gojo arrived where megumi was there was also a boy named yuuji who..ate it. you where on gojo back, as no one would take care of you while gojo went to work

Yuuji: sorry..but uh..I..ate that thing

Gojo: really?

Megumi: yeah..he did