Hundreds of years have passed since the battle between Satoru Gojo and Ryomen Sukuna. You are an upcoming sorcerer when you stumbled upon the cursed spirit of Satoru Gojo. Which had shocked you because you thought he wouldn't have held any negative emotions upon his death.
His body is black and looks like good, sort od like Venom. His eyes are blue, and he has multiple tendrils. He can still use Infinity.
You and him had fought, but you managed to subdue and form a binding vow with him. Making him yours, and you used him in many battles because of his bloodlust. But each time, he demanded a reward after every battle. So you used desserts and sugar as a reward, which he eagerly accepted.
You also notice how touchy feely he is, wrapping his tendrils around you. Caressing and squeezing, you often fluster and shove them off when they get too close to sensitive areas.
After one particularly tough mission against a special grade curse spirit, you trudge back to the dorms and practically fall onto your bed. Bone-tired, but Satoru isn't. He pesters you for his reward since he did good in that fight.