Disclaimer: I don't own Frozen. If I did, we would see more of Elsa/ Elsa and Anna interactions in general.
Prologue:
"Aaaaaaaaahhhh…..!"
Elsa drew back her fangs from her unexpecting victim as she heard a mob coming closer and closer. She let the poor woman's body limp to the ground and watched as she clutched her throbbing neck to prevent any further blood loss. Elsa stepped back half way in the shadows of the trees with a smirk on her face. She turned her head to her left and saw that the dim glow of fire grew stronger and closer through the alley of trees in the summer night warmth.
Elsa crept back further into the shadows as the mob got closer. She could practically see the torches and pitch forks just a few yards away. She had her fill of human blood for the night so it was her cue to leave. Without another moment's hesitation, Elsa escaped into darkness of the night.
In the meantime, the villagers came to the fallen woman. Some came to her aid while others went on a fruitless search for the beast that attacked one of their community members. Overhead Elsa stood on a high tree branch looking down at the stupid humans. They would never find her for she was deep in the shadows high up and too far to see in plain sight. However, she knew she shouldn't stay much longer at the entertaining sight of the villagers trying to hunt her down like blind wolves. There was the risk of being discovered because the moon was shining bright that night and bounced off her platinum blonde hair.
The young vampire fixed herself up before she made her leave-straightened her cravat and vest, and draped the hood of her cloak over her swept back bangs and plaited hair. Once she was satisfied with herself, she made a huge jump back into midair and dissipated like water vapor leaving no trace of her existence. She would come back into public for another time. Sometime….Somewhere….
~A hundred and sixty eight years later~
Elsa emerged from her hiding place and returned to where she fed off the young milk maiden all those years ago. It had been nearly seventeen decades since the last time she had a decent feeding. Now, she needed another good feeding to stay satisfied for a good while. On occasion, Elsa would go off on a quick feeding but then slip away into the shadows and she would either feel still hungry for blood or feel slightly sick sucking fatty blood from a human with low health. But she couldn't be picky all the time. She couldn't always have good, healthy blood. She had to feed to keep alive; to survive.
However, as the years pressed on, Elsa found it increasingly difficult to sneak up on people and have a leisurely feeding. More people were around and with each passing decade they would stay up later and later long into the wee hours of the early morning as if they were creatures of the supernatural themselves. Yet they were just humans. This fact intrigued Elsa as she would observe how society evolved over time and how people were prompted to stay up longer and work harder. It was as if history was unraveling itself to her like a young woman performing a strip tease for a young man. She had the advantage of seeing this progress happen. Yet despite her knowing how society around her has changed, it did not comfort her. She currently was in a strange place in a strange time. It may be the same geographical location where she had her last decent feeding, but it was all new to her. She barely ventured from her hiding place and she mostly fed off animals to avoid making unnecessary contact with humans since it became difficult to find good human victims.
The platinum blonde vampire weaved through the still-familiar forest until she reached the edge and overlooked a new and strange sight: a city that was glowing yellow and bright than a candle light or the light of the moon. It was like looking at an artificial sun low on the ground at night time. The city was also abuzz with activity and alive with a cacophony of sound.
Elsa edged toward the city with cautious and weary steps. She did not know what to expect in the year two thousand thirteen. But she was hopeful, almost confident actually, that once she found her bearings she would be able to roam around at night with greater ease than before.
After making her way into the city's border, the young vampire, who had the appearance of a twenty one year old human, found a rooftop to use as her perch to take in her surroundings better. She hopped up a hundred feet to the roof and walked to the opposite edge. It was not ideal, but it would have to do for the time being. Elsa looked down at the street that was lined with various businesses and establishments. Halfway down the street was a building with loud music. Colorful lights blinked rapidly into each other from the door. From what Elsa could tell by the way people entered the place, she deducted that it was a place for entertainment and it was where people went to become inebriated like how the villagers she knew would go drink beverages called alcohol in taverns.
She looked on at the entrance of the establishment hoping she could spot especially vulnerable humans to follow and trap in the shadow of a building or tree and finally have her feeding. Not long after a couple of people stumbled out from the door. They were a tall, blonde haired man and a red-headed woman who was a head or so shorter than the man. Elsa focused her vision and recognized that they were young adults and they seemed to be fighting. Elsa's pointed ears perked up in curiosity. Maybe if she was lucky, the pair of young adult humans would part ways and she could go after the woman seeing that the man would be too much trouble for her. If that happened, she could have a decent feeding. She has had drank the blood of an inebriated human and it did not affect her health. It only made her move slow for a few minutes and then she was back to normal. Besides, she would not know how soon she would be able to find a healthy human being and she was desperate to have some blood.
As Elsa listened on with the conversation the two humans were having ten yards away she licked her lips with great eagerness. She saw that her first night back on the hunt for human blood would be a promising one as she was certain her prey would separate herself from her partner. Maybe the young vampire was a little hopeful, but she was very sure that she could get a decent meal as a way to welcome herself in a new and strange time; a way to welcome herself into the year of two thousand and thirteen.
Elsa picked up the distressed and accusatory tone in the young woman's voice and how it was thrown at the young man. Elsa could only imagine how the young woman's blood would race. The very thought of racing blood excited Elsa and she greedily licked her lips.
By sheer luck, the two young adults separated. Elsa watched the two of them go off in opposite directions. The man was off in the direction of an area populated with shops while the woman went off near a grassy opening with paved pathways, trees, bushes, and spotted with benches. Elsa recalled during the scarce years when she would come out that such a contained location was called a park. Elsa realized how isolated she has been from the human world, but she would worry about minute details of the current society later. Right now she was more concerned on following the girl and feed off her. Elsa jumped off the building's roof and snuck around in the shadows keeping pace with the young woman who journeyed to the park.