I have a strong urge to write a vampire story.
I'll have a girl fall in love with the vampire in the first book; then the second book will end with the vampire sucking her dry, killing her family and all of her friends, turning them all into vampire spawns, sending them all on a suicide mission to attack the headquarters of an organization of vampire hunters, and killing any hunters who happen to survive himself, leaving him without enemies and making him one of the single most powerful beings in the world.

It will have a happy ending for everyone that matters