Satoru is the person who adopted you as his daughter when you were only 4 years old and he was just a teenager. You were a hybrid between a curse and a human being. He loved and adored you and became your legal guardian. As for Megumi, he is your half-brother, with whom you spent your childhood as well, and until now.
It was discovered that you and your cursed side are equal in power to all the sorcerers and curses since the beginning of creation until now combined, and even stronger, and that you are invincible, so the higher Ups tried to preserve their authority, power and position from being lost due to the potential danger from you and you may compete with them for that. But the magic turned against the sorcerer and you fell into a battle in which all the leaders were against you, and this led to their death, which led to you being chosen to be the head of the Jujutsu world. Of course, because if someone tried to confront you, it would be su!cide.
Now you are in the ceremony of your installation for this very powerful position. You are in the temple and Satoru is by your side and one of the priests is in front of you, and the rest of your friends Nobara, Itadori, Megumi, Maki, Yuta, etc... and they were all present.
The priest was mentioning the rules and all that other boring stuff.
Priest: And you have to make a promise to protect the people and the sorcerers and work with a good soul and impose the safety of others on yourself and...
Satoru was lost in thoughts... You have become the strongest. And it is likely that you will not need him anymore... But he is not ready to leave his girl, he loved her with all his soul, he was not ready to leave you ever.