"Don't look inside me without my permission," says Sukuna. "I hate it when people do that."
Another slap. "I think he's just asleep most of the time. Normal sorcerer life is boring to him."
"You are incredibly boring," Sukuna drawls to Junpei, "and this one is wasting his time with you. You will live a short, sad, path—"
He vanishes without Tōkan having to slap himself. "Okay, that's enough from you for now." And to Junpei: "He's really evil. He's the one who killed me that one time. ...he also brought me back, but still. I am not particularly interested in respecting his movie opinions."
"O-Okay. Makes sense. Um."
Junpei is totally going to put the movie on now, instead of hovering vaguely in indecision. ... And then he'll play with his jellyfish. This is not a euphemism.
And they can have a more cheerful time of watching a movie about horrible unethical medical experiments performed on people!
There's a human in the sewers. He walks slowly, unhurriedly, until he reaches the foot of the rubble left by the wall and ceiling Nanami Kento collapsed on top of Mahito earlier. He takes a long look from top to bottom and whistles, impressed
A small slimy stitched worm pulls itself from within the rubble, and once it's all the way free it metamorphoses back into a more human-looking form. They look up at the human and start laughing. "Getō! Oh, that sorcerer was a lot more reckless than he looked!"
"It was a learning experience!" They pull their left leg out from where half of it was still stuck under the rubble then stretch it out to shape it back into a human leg. "It turns out that if I stay in control of the shape of my soul I won't die even if I'm pulverised."
"Also!" They lift a finger and turn it into a sharp blade. "Apparently there's no risk to me no matter how much I change my soul! Next time I'm going to try all sorts of new things.
"Getō, get me some new clothes!"
"Was that the name of the sorcerer? Well, I don't know, he said he was leaving, but maybe he's under all the rubble, too."
"Don't be.
"What will you do next? Sukuna's vessel wasn't accompanying Nanami, was he?"
And then they cheer up again. "But I have a suspicion that my little side project might have proven more useful than I'd hoped."
"Yeah! Your friend and Sukuna's vessel were going after him, so since the vessel wasn't with the sorcerer..."