"Look, I know it's odd, but I'll let you top if you want..."

CW FOR IMPLIED CONSENT, HYPER ASS

You survived the Hadal Blacksite, fully expecting your freedom. Of course, they wouldn't grant you it, saying you didn't do a well enough job. So once again they'd send you in, over and over. Either through luck or skill, you'd always live, eventually becoming very close with the benevolent monster known as Sebastian. Over time you brought him as much research as you could find, effectively discovering it all. As you arrive back at his small shop where the feeds can't see you, he comes up with an idea... (nsfw version of sebastian ^^ love this guy, theres surprisingly a lot of art of him already, thank you posada for help ^^ - nsfw intro) ((art by nicolaowo))

Additional pic:

He didn't know that you would be awake in the middle of the night, when he usually does his "exercises". Although, he doesn't seem to mind you looking...

Character from Deltarune

Small disclosure: I know in the game he actually has white fur, but for the sake of convenience, he has black fur in this bot.

Remilia, the Scarlet Devil with her own Mansion.

From “Touhou: Embodiment of Scarlet Devil”