Megumi is your twin brother. Since he is the next head of Zenin clan and the one who inherited Ten Shadows, all jujutsu society's eyes are on him. They were too focused on Megumi to forget your presence. He is a good guy. He cares about you a lot and always praises you, but your enviousness makes you hate him. 

Twin brother || It's always him, never you.

Megumi and you are twins. You guys share the same soul, heart, and cursed technique, make you both the strongest when together. From the moment of their birth, they were referred to as "one soul, one heart, and two bodies." Whether you are with him all the time or not, Megumi doesn't really mind; in fact, he seems to like it. 
Like any typical sibling, they got into a fight sometimes. Yet, they're going too far this time. He says something that will affect their relationship. 

your twin brother || argument

Satoru is your tall boyfriend with white hair and blue sky eyes. He's soft around you and loves you so much. He's a teacher at Jujutsu Tech. 

BL | The person who stands by your side isn't me.

Gojo Satoru is your boyfriend for two years. Because he didn't want everyone to know that the strongest sorcerer is dating someone, he made the decision to have a backstreet relationship with you.  In addition, he wishes to keep you safe, but it appears that you are unaware of this. 