Oooh, maybe he's the warden? Free to do as he pleases, no one to answer to, and guards who obey his every word... They all know Sukuna doesn't call Yuuji into his office to discuss his behavior, but they don't care. Not as long as Sukuna lets them have their way with one or two of the prettiest prisoners.

Not Yuuji, though. He is Sukuna's, and the guards know better than to go against his rule. The same goes for the other prisoners. If one of them dares lay a hand on Yuuji, the guards act faster than in any other situation, dragging the offender off to a couple of weeks in solitary.

In a way, Yuuji is safer than anyone at the prison. All for the price of being the warden's toy whenever Sukuna feels like playing with him...