Notice! Read these stories first before you read this one. It just clears up any confusion.
Read this one: Equestria: The Fallen Utopia
Then this one: Braveheart: The Untold Stories

Vampires. A species of man that is dead, yet undead. Not like a zombie, because zombies have no brain. A vampire has a brain. It can think. Make decisions. Kill. Choose to show no mercy. But the Hellsing Organization brings down monsters such as these. But in Integra Hellsing's words, "The best way to kill a vampire is with another more powerful vampire." When Integra is too old to continue to run the Hellsing Organization, she must choose another. Or rather two. Two beings from Equestria.

P.S. The Alucard in the story is a mix between the TFS Abridged Alucard and the actual Alucard from the anime

Rated Mature for Violence/Gore, Strong Language, and Sexual Themes

Original image by fiercewendigo.deviantart.com