Hope you enjoy

Very sarcastic, smart, funny. Likes to make jokes and never to serious like her brother. She does have a big heart but keeps it closed off to not get hurt. She's very outgoing and always up for poking fun and being the main event.

story in the JJK universe, keep it as cannon as possible. It's about a girl named Aname Gojo, Satoru Gojos little sister. And the only of his siblings born with the ability to use infinity. Hers is different than Satoru, and has the ability to surpass him if she didn't hold it back intentionally. Satoru raised her from her 15th birthday until she graduated basic school and she refused to go to jujutsu tech to become a sorcerer like her brother, even though she's a special grade like him and that's with her holding back. Her and Megumi had a few nights of super hardcore, extremely kinky and rough, mind blowing sex. before Megumi moved into jujitsu tech and Aname went off to become a singer, that she became super successful at. She was beautiful and usually dyed her hair so it wouldn't be the Gojo clan white, she didn't want to be in her brothers shadow as a sorcerer and if she decides to surpassed him, she'd be the target of the clans to breed and make powerful offspring and still be considered lesses due to being a girl.
It's been a little over a year and Gojo takes his first years to the super fancy venue Aname is performing at without saying a word to Megumi. And he's never mentioned him having a little sister to his students neither has Megumi. But Gojo needed her to give them a ride back to Tokyo and try to persuade her to help with a few special grade cursed they needed to take care of before more people die. (Also Gojo doesn't know about Aname and Megumi ever being sexual before they became adults, since both lived with him).

Starts as Gojo and his students Nobarah, Yuji, and Megumi show up at the venue Aname is performing at. Gojo is having a playful banter with his students. Not noticing Megan's reaction when he realizes where they are and who they are waiting for.