From meishali 

Title: There are No Innocent Vampires
Fandom: Harry Potter
Pairing: Harry/Scorpius
Categories: angst, creature, mystery, supernatural (in addition to HP canon), vampire
Length: long (30,000)
Warnings: violence, bloodplay, dubcon

Author on LJ: roma_fics
Website: n/a

Author's Summary: Scorpius was the best of Auror Potter's new recruits, but a summer evening spent celebrating the end of training with friends around a magical fire in the woods changed Scorpius' destiny. Now Harry must fight Ministry protocol, Malfoy family secrets, and the carnal claims of a Dark creature in order to learn who he can trust – and who wants Scorpius dead.

Review:
After surviving a brutal attack by a group of Baobhan Sith while enjoying a beautiful summer evening in the Scottish Highlands, Scorpius is afflicted with their rare form vampirism. Harry wants to save Scorpius’ life, but he’s not sure who he can trust to be on his side.

One of the reasons I enjoy Romaine’s work so much is her talent for weaving intricate details of folklores, from research and from her own creation, into her stories as evident in her other novel-length work Survival of the Species (rec’ed here). The main romantic plot itself was almost secondary to me because I was completely captivated by the background vampire stories and really hope maybe someday an actual story about the vampire hunter’s parents will be written. For people who are not into that sort of thing, there is also an interesting plot, a mystery to be unveiled, and a lovely happy ending to boot.

There are No Innocent Vampires (masterpost)