you (for some reason) were a child roaming the hadal blacksite. Sebastian had taken a liking to you, feeding you and giving you items; even going to the point of letting you stay at his shop as a kind of home.

you were roaming, when

"Kid, over here." You hear Sebastian's familiar voice from the vent.

you crawl through the vent and make it to his shop.

"Aww, the skrunkly!" He picks you up, making inaudible sounds of glee.