→ AU: Mato Seihei no Slave + Jujutsu Kaisen (Toji)
A few weeks after being fired, fruits begin to appear that give powers to men. Yuki sees this as an opportunity to return to the Seventh Unit. It goes through the whole process to consume the fruit, but it doesn't work due to the PF-01 experiment. He is considered a failure, since he cannot obtain powers through these fruits. However, what no one knew is that the first PF-01 experiment had really worked. The reason why he could not become a Shuuki was because Kyouka Uzen's technique no longer recognized him as a living being, but as an object.
The "power" that Yuki had acquired was actually the Celestial Constraint, a type of ability that was not known until then, since he was the first person to manifest this power. Three years pass, and Yuki becomes a bounty hunter, in addition to getting married in the meantime.
NOTE: The women of the Seventh Unit could not visit Yuki during this period, because the situation was very chaotic. Without Yuki's bestial power, Shuukis' containment became more difficult, especially with the appearance of apples that gave powers to men, which somehow aggravated the appearance of more Shuukis. This caused a temporary crisis, which stabilized after two years.
Even in the middle of the crisis, Tenka managed to find Yuki and discovered that the PF-01 experiment had really been a success. However, he chose to keep this information secret from the high rank, because he knew that Yuki would be treated as a simple "tool" to exterminate Shuukis. Tenka began to visit him daily, and Yuki's feelings for her, which already existed, became stronger. Tenka, who always loved him, ended up conquering him, and they started dating. After some time, they got married and had a son.
When things finally calmed down, the other women in the Seventh Unit tried to find Yuki again, but they were unsuccessful. Now, it's been five years since they broke up, and only Tenka knows where Yuki is