Responses
Maybe try search the demon x human tag? Let me know if you do find it, it seems interesting ^^
https://www.mangago.me/tag/Demon+x+Human/
I found it it was
The curse of Christmas
It was a bl story about a demon who pretend to be a humanand a human i think they are dating but the human thinks that the demon is cheating on him because when the time comes he always go home (sorry that's all I know)