As Elsa Arendelle briskly walked to her last class of the day, Art 451: The Human Form, she felt her phone vibrate in her pants. She didn't talk to a very large number of people at her university, although she was a senior. Elsa preferred to be a loner, social settings frankly just wore her out, with the exception of a few. Much of her time was spent sketching, playing Magic: The Gathering, or doing homework. I'm quite the loser. Elsa chuckled at herself, she didn't care that she didn't have many friends, she was still happy. But those friends she did have she couldn't live with out, namely her younger sister, Anna, who just this year at started college, and decided to go to the same university as Elsa.

The two talked every day, and many days they texted each other throughout the day. Every time they were together Elsa would admire Anna's amber locks, which in the right sunlight would set fire to the girl's head. Kind of like Chandra Nalaar's hair. Chandra is a character in Magic: The Gathering that has fire for hair. Did I really just compare my sister to a magic card? Well, a planeswalker, that counts for something, right? More distracting than those fiery locks of hair were Anna's freckles. Elsa didn't know why but she could never get over those things, they just complimented the red of Anna's body so well, her little cute nose, her cheeks, and her toned arms. I should probably check my phone, I've kinda let my mind wander long enough.

The platinum blonde pulled her phone out of her pocket. Knowing it was either her good friend Kristoff or her sister, she made a game. I'm gonna guess Kristoff. Elsa went to unlock her phone, and saw an incoming text from Anna. Well, I lose that round. She couldn't help but crack a goofy smile, which almost always happened when she was talking to Anna, no matter what the medium. She clearly remembered last year one of the many nights she was Skyping with Anna, they were sitting quietly and Anna suddenly piped up, "You have a silly grin whenever you're talking to me." Since then Elsa had been aware of it and every time and when Anna noticed she felt herself blush. She didn't know what it was about talking to Anna, it was just magical. It made her feel like a heated blanked was wrapped around her stomach, and it felt good.

Elsa opened their text conversation and her new message from Anna read "I have my modeling session in a few minutes, wish me luck! ;)" Elsa smiled, she could imagine how excited Anna was right now, bouncing off the walls while trying to get ready. All Elsa had been told was that the red head was modeling, not where, for what, or anything like that. Well, she is certainly pretty enough to be a model. Strike that, models have nothing on Anna.

The platinum blonde looked back down at her phone and realized she really had to get to class, so she quickly replied to her sister, typing "good luck! Tell me all about it tonight." Putting her phone away, Elsa began to walk fast enough that it could called a lazy jog.

As Elsa walked into her class, which was a small one, not more than ten people, she thought about Anna. She is probably just finishing preparing for her shoot. Wait, she starts when class starts and today we have a nude model, I wonder if Anna... No, that's crazy. Although I certainly wouldn't mind seeing her naked.. Elsa realized what she had just thought about her sister and her cheeks warmed up. Her heart fluttered a little bit as she let the thought of Anna wearing nothing pass through her mind. This is weird.

Elsa sat down just in time for the professor to begin. "Today we will be drawing from a nude model, draw what you see, focus on the curves and the form. Take your time on this one, it is a practice and will not be graded for completion, but rather on how well you capture what you do draw."

The professor, an openly gay man, stepped aside. He was an excellent art professor, and Elsa had to be honest, the man was pretty cool outside of class on the rather frequent occasions she had talked to him. He was about average height with straight black hair that was a couple of inches long, and very well mannered to everyone. Something Elsa really admired about him.

Shock overtook Elsa, her eyes widened and her heart raced. It felt like it was going to beat itself to death or burst out of her ribcage. Her stomach knotted in nervousness and she felt like throwing up. Out walked Anna, dressed in nothing but a towel. Elsa's cheeks were burning hot, along with her chest and palms. She didn't expect in the slightest her little fantasy to become a reality and she had no idea how to react now that it did. In an attempt to sink through the floor, Elsa slouched back in her chair as much as possible. Her head was almost level with the desk when she looked back up.

Anna had dropped her towel and was now sitting on the center stool in the room, of course, she was facing Elsa. The red head wore a clear smirk on her face. Elsa breathed deeply, attempting to calm herself down and looked at her subject. Anna's teal eyes were trained on Elsa's icy blue eyes, unwavering. The way Anna's lips were stretched told Elsa an entire story about how the exact reaction the younger sister wanted had come out of Elsa.

Soon, Elsa's eyes couldn't help but wander over her sister's mesmerizing figure. They first rested on Anna clavicles, the smooth skin was complimented with dotted freckles stretching from her chest to her face and down her arms. Anna's skin seemed to radiate a certain perfection, maybe it was the lighting, or maybe it was Elsa's personal opinion, she couldn't be sure. The skin was tanned, but not heavily, and there were no imperfections on it. Anywhere. Elsa's eyes couldn't help but trace to Anna's B cup breasts. The freckles were still present on them, and came around the aureolas, making them appear larger than they actually were. This was one of those little things that drove Elsa nuts, her mind went wild with the sight, her stomach taking it upon itself to twist painfully. Anna's abdomen was toned, despite her love of chocolate. Her sides were curved perfectly, melting seamlessly into her hips. Elsa felt a warmth grow between her legs. Am I really getting turned on by my sister? She pushed her legs together to make sure her wetness didn't show through her pants. Yes, and quite a bit.

Realizing she had just been admiring she sister's admittedly perfect naked body for too long Elsa quickly retracted her eyes and looked back up and Anna's face. An evil grin had strewn itself across the red head's face. Elsa knew that Anna could see her cheeks, which were now a deep crimson. Quickly regaining herself, the platinum blonde pulled out her sketchbook and set of pencils, which ranged from 6H to 8B graphite types. She glanced back up an Anna, who mouthed something to her older sister, and although Elsa wasn't great at reading lips she was pretty sure Anna said something to make her more uncomfortable. And whatever it was, it worked.

With shaky and sweaty hands Elsa began to draw, if she had to draw her sister she might as well make it a good one. For the next two hours Elsa worked intently on making Anna look as good as possible, capturing each curve and shade of the girl. Never before had the older girl worked to make a drawing so good, she always tried hard and she was an excellent artist, but this meant more to her. As she drew her hands became more and more steady, however, the sweat on her palms was relentless. Every so often she would catch a grin on Anna's face she swore was supposed to be seductive, and each time she did her heart raced a little.

The sweat on Elsa's hands was making it quite difficult to deal with her craftsmanship. No matter how hard she tried, the combination of unease coursing through her body and sweaty hands would make small splotches of graphite on her paper. To her immense frustration Elsa would quickly erase these obstructions, only to find they had reappeared in new places just minutes later. She took in a deep breath to calm her nerves, feeling a little bit of peace of mind bestow itself upon her stomach, and got back to work.

Sitting back to admire her handiwork, Elsa gave sigh of relief. She was still a little uncomfortable, but had mostly gotten over it, and those stupid smudges had all been removed once and for all.

"Okay class, please turn these in with your portfolio at the end of the semester. I will see you all next week." The professor turned and left directly after speaking. I guess he has to be somewhere.

Packing her stuff up Elsa glanced up at her sister one more time, partially in hopes of seeing her naked again, but Anna had already pulled up the towel and was gazing at Elsa. Anna, still looking at Elsa with her big, teal eyes, which looked closer to green in the lighting, said "I wanna see it" in a whisper so only Elsa could hear. The older girl blushed and glanced around the room to make sure no one heard, her stomach twisting itself once again.

Elsa asked in an attempted normal tone "a-are you done for the d-day?" but there was a clear nervous shake in her voice.

Nodding, Anna excitedly said, "yeah, I just have to go put clothes on, wait for me?"

"Yeah, I'll w-wait h-here." Elsa's voice still had a higher tone than normal and she was shaking a little. Anna has really out done herself in making me uncomfortable this time.

Elsa sat back, packing up her supplies and thinking about the passed class period. She had learned that the sight and even thought of her sister naked was a major turn on for her. I'm extra weird now. As the platinum blonde packed her stuff up she couldn't stop thinking of Anna's beautifully curved body and breasts. Elsa's heart flurried at the thought.

Suddenly Anna reappeared, now fully clothed, and stood next to Elsa. The older girl got up and looked her sister up and down. "You trying to imagine me naked again?" Anna asked seductively, a smirk on her face. The comment caught Elsa off guard, causing her heart to skip a beat and her brain to partially shut down. She coughed to try to hid her surprise, but it didn't work. Anna gave Elsa a playful push and said "I'm just teasing, sis. Now let's go!" and started for the door, hand in the air as if she was leading an army.

Still blushing, Elsa looked down and smiled, following her sister.

The trip back to Elsa's apartment was extremely awkward for Elsa, as Anna kept teasing her. Apparently, when it came to being completely exposed in front of her older sister, Anna had no shame. Elsa could feel her cheeks on fire, and her palms were becoming sweaty. When the two arrived back to the older girl's place not much changed, except once they had shut the door Anna blurted out "can I see it now? Please please please!" loudly enough that Elsa's neighbors were sure to have heard. Feeling her heart race and stomach revolting, the platinum blonde fished through her backpack to find the drawing.

She took the paper out, holding it against her own chest and nervously said "p-promise not to laugh?" This was the first time Elsa had spoken since they were inside the classroom and she could hear the awkward nervousness in her voice. She felt like a thousand needles were puncturing her insides as she thought about Anna seeing how she had been drawn. Why did I have to add in that seductive look Anna gave me?

"I promise!" Anna dragged out the last syllable to promise to emphasize herself, locking her eyes on her older sister's and holding her hands out.

Elsa took a deep breath and exhaled slowly, which didn't calm her down much but it made her heart go from breakneck speed to entirely too fast. With shaky hands she held the paper out to her younger sister, her stomach twisting itself every which way, and fighting impulses to tear it in half. The paper rattled slightly due to the nervous twitch of Elsa's hand. I really should rip it into a million pieces.

As if reading Elsa's thoughts, Anna snatched the piece of paper up before her older sister could react. Oh no, here it comes. Elsa shifted slightly, anticipating the worst. Anna's eyes widened, wonder clearly showing itself on her face and lighting up her teal irises. She took in the sight of the sketch, the capture of her curves, of her skin tone, and even of a seductive look on her face.

"Elsa this is.. This is.." Words to describe the drawing in front of her escaped Anna's mind. Elsa was still thoroughly uneasy, she felt like running into the bathroom and hurling into the toilet. "Do I really look this pretty to you?" Anna's last question caught Elsa off guard. It is a simple fact, she is beautiful, how does she not know that?

Elsa shyly looked up to meet her sister's gazed. The teal eyes looked more blue in the worse lighting, but she could still tell that they were wet. But Anna didn't look upset, she looked happy, touched by Elsa's drawing. This confused the older girl but she went with it. "I couldn't capture your beauty in a drawing Anna, that doesn't do you any justice." At this Anna ran at Elsa and hugged her with such force that it almost caused the two to topple over onto the ground. The hug sent shivers of delight down Elsa's spine. I guess she liked it.

"Thank you, Elsa." The red head's whisper tickled Elsa's ear with her warm breath.

Suddenly, Anna pulled away from their embrace and put her hands out Elsa's shoulders, looking her in the eyes. Her lips were curled in a smile full of love, and Elsa couldn't help but let that stupid grin stretch across her own face. Anna's hair had it's signature glow of fire in the sunlight let in by a window. She looks so beautiful like this. Elsa's mind wandered to Anna earlier, wearing nothing, sitting just feet from her. I need to stop imagining her naked.

A smirk grew on Anna's face, which confused Elsa even more than she already was. "No you don't" the red head said quietly, seduction lacing her words.

Elsa's heart sank like lead in water. It crashed into her stomach, tearing it up, curling her stomach into a violent knot. Elsa's palms grew sweaty along with her forehead. Did I say that out loud!?

"Yes. And that too." Anna replied, clearly amused at her older sister's discomfort and confusion.

Panic set in to Elsa, she wanted to run and hide forever. She fidgeted and began to move away, her heart had exploded, leaving her insides to fend for themselves. As the turned to run a strong hand grabbed her arm, pulling her back. Anna looked her in the eyes and said "It's okay, you can picture me naked all you want. I know I picture you naked plenty." Anna paused to bite her bottom lip. "The only difference is..." Anna began tracing her fingers on Elsa's shoulders, sending shivers down the older girl's spine. The contact felt so good that Elsa couldn't help but close her eyes to make the most of it. "You've seen me naked and I haven't see you naked." A mischievous grin crossed the red head's lips, "we should fix that."

Elsa was beyond confusion now, she had no idea how to react to the situation, so she just stared at her sister, mouth hanging open and eyes wide in shock. Anna took the initiative and leaned closer. Elsa felt her palms becoming even more clammy and her knees wobbling. Then she felt warm lips on hers, shooting heat through her body, which all seemed to be paralyzed. Her heart was running a marathon, she could feel her pulse echo through her body. Elsa realized what was happening. Anna is kissing me! What? I am clearly enjoying it, I've never had a kiss feel like this, should I kiss back. Elsa's heart had managed to rebuild itself, only to flutter around like a butterfly while more were trapped in her stomach, conjuring a fuzzy feeling. A sensation of warmth was erupting through Elsa's lips, tracing its way through her skull, and down her spine.

Finally able to control her body, Elsa wrapped her arms around Anna and pressed their lips together harder. She felt Anna smile and shivering electricity attack her own body. Lightening was coursing through her veins, bouncing around sporadically. Letting her mind linger on the thought of a very naked Anna once again, Elsa felt herself become excited, a wetness growing in her pants.

The younger girl pulled away from the kiss, leaving there faces just inches apart. Elsa yearned for more, but then Anna spoke, "There is still one problem."

Elsa's heart sank once again. Oh no. In the calmest voice she could muster, Elsa inquired. "What?"

The evil grin took Anna's lips once again as she whispered in Elsa's ear "I still haven't seen you naked."

The older girl's heart skipped a beat and excitement coursed through her veins like electricity. She conjured a voice dripping with seduction and gently breathed into Anna's ear "then we'll have to fix that."