Pure of Heart (For "Vampires, Werewolves, and Zombies..." Competition)

Thump, Thump, Thump,
Her feet slaps the pavement as she runs.
She runs completely unaware,
The smell of her perspiration is intoxicating.
I flint after her,
Quick as light, quieter than silence.
She never knew I was coming after her,
Until it was too late.
I hit her from behind,
Hard enough to knock her off her feet.
But not hard enough to bring unconsciousness,
I love the terrified look in her eyes when I reveal myself.
And she doesn’t disappoint when I show her my fangs,
Her eyes get wide, her pupils dilate, her heart rate increases.
The amount of rubies flowing through her veins increases tenfold,
I sink myself into her neck with little force, she gasps, then moans.
I guess she takes a little pleasure in this,
They all do.
Her heart slows down as her beautiful essence is absorbed,
Absorbed by me.
It has only been a couple minutes when I finish feeding,
She still breathes.
I can’t stand to take the life of a woman with a heart so pure,
So pure that I'll most assuredly return for another taste at paradise.