Creating an alien werewolf
For the most part, Savannah's looks don't change. Her physical abilities and mannerisms are what's effected. She's faster and stronger, and gets the urge to procreate during the full moon. Another thing that she hasn't really noticed, and it's not in the story, is she's developed an appetite for meat and often takes her steaks at medium rate to rare. Before she wouldn't be caught dead eating something cooked below medium or bloody.
Alien vampires are real
As for the alien creature, what I had in mind was something aquatic. I imagined something like the opposite of whales which breathe oxygen, but can spend hours under water. These creatures can spend hours on land, but only breath underwater and hold their breath when out of the water. But since Evan is human and breathes oxygen, he can't breathe underwater. If he had been a fish spliced with this creature that'd be a different story. ;) Also, imagine something with a body like a crocodile, but the scaly skin isn't as rough.
Evan Sullivan never gave extra-terrestrials much thought until the night he and Savannah were abducted. While Savannah’s memory was wiped clean, he remembers every horrific detail. Constantly reminded of the experiments that made him less than human, Evan hides in the shadows and watches Savannah rebuild her life without him.
But neither can let the other go. When their paths cross, Savannah and Evan finally see a glimmer of their old lives return. As they face what happened to them, they soon discover they aren’t safe. There’s more to fear than what’s hiding in the stars.
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