Hey guys/gals, I am trying to write up a piece of backstory for a character I am developing, but am a bit unfamiliar with how to incorporate cross-genre material. Wondering if I could get some help.

The idea is as a kid, the character saw his parents die in a fire -- no big thing there.
But the reasons behind it get elaborate. The parents somehow angered a group of supernaturals, and as a means of penitence, they willing bartered their lives for the safety of their son (the character).

My questions pertain to the involvement of / likelihood of mortals to have a business relationship with the Fae Courts / Mages in England around the 1700's.