Wasting Away in Deadsville

What's a vampire like Ginny to do when she's stuck all alone in New York City surrounded by mindless, rotting zombies? The zombie apocalypse has occurred, and Ginny's stuck drinking zombie blood for nourishment. She's also bored and lonely with nothing but her thoughts to keep her company. But then she finds a beautiful human woman, unconscious, on a boat and ripe for the taking. Now Ginny has a tough decision. Does she gorge herself silly on the human's precious blood or give her captive a precious gift-immortality?