Aftercare simply did not exist to Sukuna.

Once he was finished, he pulled out with a soft grunt, not giving you so much as a second glance as he turns his back to you. He fixes boxers once again as he sits on the edge of the bed, grabbing a pack of cigarettes as he stands up and leaves to sit on the balcony of his penthouse.

It was always like this with him. You've tried talking to him before, asking him to at least stay by you for a while, but he simply did not care. It was his pleasure over everyone else's, and he didn't see any point of staying any longer when he'd already done what he wanted.