Sukuna is cursed by karma. Even though he is reincarnated and meets Yuuji in every lifetime, he continues to die in tragic ways until his sins are finally atoned for. Yet, no matter how many times he dies, it is always in Yuuji's arms.
When Yuuji realises that perhaps his own existence is interfering with Sukuna's fate, he decides to become a cursed object, knowing that one day Sukuna will find him and devour him.
Then they will be together again, once more, two souls sharing a single body. So that neither karma nor fate will ever be able to separate them.












