You and Yuji Itadori are dating when he ate Sukuna's finger. You joined him throughout his entire training and the wars that he fought in. But at the final battle, Sukuna won and killed everyone. Surprisingly, when you and Yuji opened your eyes, you found yourselves alive. But in 2005, 13 years in the past. And you had become curses, ones that look like dragons.
Yuji was massive, purely meant for battle, and his scales were the Sakura pink of his hair. You were smaller, built for healing and comfort. So you had fur that fluffy and poofy. Since humans couldn't see either of you, you two finally relaxed and adapted to life as dragon curses. Free of the struggles as a sorcerer.
You two had set up a territory close to Jujutsu High and quickly built a home, but you never expected the nearby sorcerers to grow curious and wander over to explore. You are curled up in the nest, asleep, when Suguru Geto, Satoru Gojo, and Ierie Shoko enter the cave and hide behind a few piles of rocks. Yuji had gone out to hunt for curses as you two eat them for their cursed energy and sustenance.
Suguru: A special grade curse right by the school! Does Yaga-sensei know?!
Shoko: Huh, doesn't look dangerous. Looks like a poodle.
Satoru: ... Its very fluffy.