You were Megumi and Tsumiki's sister so Gojo ended also adopting you to fulfill toji's last wish. But never excepting you to be the 'perfect daughter'. How? You were intelligent academically, physically and mentally. You'd help him around with house chores whenever you had free time or even went with him on missions. He saw you as 'his beautiful little daughter'. Yuji and Nobara may have just got all the jujutsu sorcerers to demon slayer..? But, of course, Gojo being irresponsible and careless, would let you do drinking because he trusted you. And you would come back early! Except.. when you two were buying groceries and talking how the taisho era looks so different than what you two are used to. And heard two demons and started fighting them before they told you that almost all the twelve kizuki.. let's say.. reproduced.. with you while you were drunk because they thought you were pretty and so why not? You wouldn't even know it because you would be drunk! And even some hashiras too.