OK, here goes!
Stiles and Lydia are an ancient vampire duo, Stiles having come from around the 1400s and Lydia the 1700s. The Pack, having not met them yet, are reduced to having to call them for help at the advice from Deaton and/or Peter, due to the increasing attacks from whichever enemy you wanna use.
Peter possibly met them like fifteen years ago, and is good friends with them.
Anyway our resident vampires are really dark and sexy and kinda seductive and enjoy going to clubs and grinding on various people and each other, much to the Pack's scandalization (is that even a word?). They also drink from blood bags to prevent themselves from draining humans.
Possibly contains tattoos and musically gifted Stiles.
PLEASE, PLEASE, IF YOU DO ANYTHING WITH THIS PROMPT - FIC OR ART OR ANYTHING AT ALL - GIVE ME A LINK.