(A/N: There's a G!P Anna story called Under Cover by elsannonymous. I believe it has been abandoned like so many other incredible Elsanna stories. I wish the authors would come back and finish what they started. Anyways. That story inspired this one and I wanted to see what kind of story I could write if the roles were reversed. I hope you like it.)
Chapter One: My Sister's Keeper
A terrifying storm was blowing through Arendelle that night. Heavy rainfall hit the roof of their house along with an occasional loud crack of thunder. How her or her family managed to fall to sleep Elsa would never know, but it wasn't the storm that shocked her awake, but the terrible nightmare she's been having again and again. The eighteen-year-old woman laid in her bed, deeply shaken.
Her platinum blonde hair and body was slightly wet with her fear induced sweat. All she wore was an oversized velvet silk nightdress, nothing else. It was a comfort thing. She laid there on her back, staring at the ceiling with wide deep blue eyes. Her prominent breasts rose and fell as she panted heavily, struggling in vain to calm her racing heart. It was as if she was in shock. No matter how many times she told herself it was just a dream, her guilt-ridden heart and traumatized body refused to believe it. Her eyes began to water and she quickly covered her eyes with her shaking hands, "Why am I still having that nightmare? Why can't it just leave me alone?"
You know why, don't you? In her nightmares, something terrible always happened to Anna. Elsa knew why she was having these nightmares. She couldn't claim ignorance anymore. Her very soul was conflicted over how she treated her little sister several months ago. Elsa knew what she had to do. She looked at her bedroom door. I have to make it right with Anna.
She quickly rose from her bed and exited her bedroom to Anna's across the hall. She froze when her hand was about to turn Anna's door knob. She couldn't go to Anna for forgiveness. She didn't have the right. Anna is- was her best friend and she hurt her sister. This caused Elsa's eyes to swell with tears once more, feeling the guilt. She had to talk to Anna and beg for her forgiveness or else this guilt she was feeling would eat her alive. She briefly retracted her hand to her racing heart as she debated with herself over going to Anna. Finally, she knocked on Anna's door. The knock's tempo was just like the one Anna always used to use before entering Elsa's bedroom. There was silence, so Elsa quietly entered and saw Anna was deep in sleep under her blanket.
Elsa was timid and hesitant about approaching her little sister, fearing Anna waking up, taking one cold look at her before driving her out with screaming and raging. Elsa wouldn't have fought back. She knew she deserved the worst Anna could throw at her.
Ever since they were very young, the two were inseparable and would often sleep together in one's room or the others. However, when Anna asked if they could have another slumber party together like they used to, Elsa lost control and snapped harshly at Anna. I'm too old for that! Go away and leave me alone, Anna! Grow up! Elsa fought the urge to cry as she recalled the hurt look on Anna's face right before she slammed the bedroom door on her little sister. Elsa was already upset that day over something else, but that was no excuse to take it out on Anna. What Elsa did was unforgivable. Why was she bothering to ask Anna for her forgiveness when she already knew in her heart that Anna hated her and never wanted to talk to her again? Hope. Elsa still harbored hope in her broken heart that they could be best friends like they used too and her sin would be washed away forever. She reached forward to shake Anna awake but stopped herself at the last second. She couldn't wake up Anna. Her sister looked so peaceful in her deep slumber despite the storm that still raged just outside their home. Her heart ached at the thought of waking her and upsetting her for ruining her sleep. Anna deserved everything good in the world.
Elsa suddenly had an idea. Anna just wanted to sleep with her older sister like they always did, so Elsa carefully snuck into bed with her sister, taking great care not to accidently wake her up. Elsa dared to hug Anna gently as she cuddled close, hoping the innocent act and her proximity with her sister would heal their relationship and Elsa could find comfort from her nightmares about Anna getting hurt. It was selfish, she knew. She was using her little sister for comfort again, but Elsa didn't have any other ideas that lonely night.
Elsa felt immense joy, feeling Anna's warmth once more. Her little sister was so warm and soft that Elsa forgot how much she enjoyed these precious moments with her sister. Anna used to always give her warm hugs and it always had the magic to make Elsa instantly feel better. Elsa sighed contently and a slight smile graced her lips for the first time in a long time. Holding Anna in her arms was already working its magic and enveloping her with comfort. Elsa prayed to God that this precious moment would never stop, that she could remain in her sister's bed and hold Anna forever.
Elsa's heart began to race when Anna began to shift in her sleep by turning over towards her. Elsa feared she had woken Anna up and was about to be loudly driven away from her bedroom. Her blue eyes widened with shock seeing that Anna was really naked. Her little sister's green blanket was no longer concealing her naked body. Elsa calmed slightly, seeing Anna was still deep in sleep, but her heart was still racing from the sight of her sister's nude body. Elsa's face flushed red with embarrassment as she tore her eyes away. However, curiosity had compelled her to gaze once more upon her sister's naked body. Elsa remembered she and Anna sharing baths when they were much younger, but she had not seen Anna naked since. What Elsa was doing was wrong but the older sister couldn't help but admire her sister's beautiful body.
She knew that Anna trained for sports, but Elsa didn't know how all that training had affected her sister's body. Elsa gazed upon her sister's lean and toned body. It was the body of a sexy model. Anna's skin was slightly tanned and covered with freckles. Elsa's eyes stared. She couldn't look away. Anna's once strawberry blonde hair had become more auburn like their father's. It was let down from her signature pigtails and disheveled. Elsa's eyes trailed down to Anna's soft, pink inviting lips enticing Elsa to kiss them so she could taste her sister. Elsa immediately pulled away with shock, not knowing where that thought came from. This was a mistake. She had to leave, but two things were keeping her in Anna's room. Elsa had not yet received her sister's forgiveness and Elsa feared if she left to return to her room, the terrible nightmares about Anna would return. For comfort, Elsa remained. She laid back down beside her little sister. Suddenly, Anna kicked in her sleep, causing the blanket off her lower body and flashing Elsa with her fully erect penis, which shocked Elsa with its size. It was easily ten inches, far bigger than Elsa ever imagined. Elsa quickly tore her eyes from her sister's hardened erection and laid with her back towards Anna. If she didn't look at her sister's naked body, she would be fine and be able to get through the night.
After several minutes, Elsa finally felt more relaxed. Her heart slowed down, allowing her to finally drift into sleep. She was awoken from sleep by Anna's familiar warmth. Elsa's eyes widened again, fearing Anna was awake, but she was wrong. Anna was still fast asleep, but…was humping her from behind?! Anna was big spooning her! Elsa's entire body trembled as she felt Anna's massive erection grind in between her clothed plump ass cheeks. Elsa's skin became riddled with goosebumps from her arousal, feeling ever ridge and vein on Anna's meaty, throbbing member. Elsa opened her mouth to speak, but only gasped as she felt Anna's hands snake around her body, kneading her concealed breasts and pinching her erected nipples before her finger tips raked down her flat stomach. Elsa's back arched without warning, accidently pressing her curvaceous ass against her sister's straining shaft. Anna snuck one of her legs in between Elsa's and began to rub it against Elsa's warm and wet core.
It was too much for Elsa. All the pleasure she was receiving had short circuited her mind and made it impossible to think and focus. Elsa managed to recall Anna's condition and that gave her the chance to break away and escape her sister's arms. Elsa stood by her sister's bedside, panting from her arousal as she stared down at Anna who was still sleeping. Anna had a rare mental disorder called Sexsomnia which forced her to moan, thrust her body and even masturbate in deep sleep. This was something Elsa overheard her parents discussing one evening while Anna was out. People who experienced this disorder have no memory what they do. It was very similar to those who sleep walk.
Elsa was conflicted on what to do. She knew she shouldn't be in there with Anna, but the fear of the nightmare's return keeps her from fleeing. Elsa also didn't want to leave without her sister's forgiveness for hurting her. If she left without acquiring that, Elsa doubted she'd ever have the strength to come back in here again. Elsa opted for sleeping on the other side of the bed away from Anna. That should work. Her sister's proximity was all that allowed her the peace to sleep. Without Anna- Elsa laid on the other side, her back once again facing Anna with only her thin silky nightdress concealing her. Before trying to go back to sleep, Elsa carefully covered Anna with the blanket, not wanting her to get cold, if that was even possible since her little sister was a living furnace.
Elsa managed to drift off to sleep again. It was a bit chilly without the use of Anna's blanket. She didn't want to be under the blanket with Anna since she was naked and her condition made her unpredictable, but Elsa was also a bit sad to have to sleep without her warmth. Being that physically close to her flooded her with so much happiness, but being without it only allowed her guilt and shame to slowly creep back into Elsa's heart and mind, making it difficult to sleep. Just being near Anna wasn't enough to chase away the demons that haunted Elsa's soul. Elsa needed Anna. She ached for contact with her sister. Her embrace. Her inner conflict was interrupted when her lower body mysteriously felt cold, but it was soon replaced with Anna's warmth.
Elsa began to panic again, realizing it was Anna hugging her from behind, firmly. Elsa could feel Anna's thighs and hard erection making contact with the flesh of her plump cheeks and legs. Elsa bit her bottom lip and whimpered as she felt one of Anna's hands squeezing her large breasts while the other reached under her night dress and begin to rub gently over her swollen inner lips and clit. "Anna! S-stop, p-please!" Elsa whispered pleadingly but it was hopeless. Anna was so far gone that Elsa doubted she could ever wake her up. A wave of incredible pleasure flooded Elsa's entire body under Anna's ministrations, causing Elsa to accidently mewl like the inexperienced young woman she was. Elsa couldn't keep the whimpers and gasps from escaping her lips as Anna's pace quickened and Anna's hips thrusted against her's, dry humping her hungrily.
Elsa could feel her orgasm coming and based off of past times she pleasured herself, Elsa could tell it was going to be her largest orgasm ever. The touch of her sister as she unknowingly pleasured her was causing this. Elsa squeezed her eyes shut, desperate to deny herself release. Please, Anna! Don't do this!
Elsa groaned and whimpered as Anna's eager fingers tried to enter her sopping wet pussy. Elsa, in an act of rebellious defiance, clenched her inner walls to deny Anna entrance. As much as she loved Anna, Elsa couldn't allow this to happen between them. It was wrong but God forgive me. I don't want her to stop. As if angered by Elsa's defiance, Anna seemed to growl in her sleep as she tried to force her fingers inside of her. The pleasure of Anna hand rubbing Elsa's clit caused Elsa to briefly slip up and unclench her inner walls.
No! Elsa screamed inside as Anna's fingers entered her. Her back arched and her inner walls clenched desperately at Anna's strong fingers as she fucked her slopping pussy fast and hard. Elsa struggled to remain silent. She wanted to scream, but she knew she couldn't because she would wake Anna and their parents who slept down the hall from them. She was so close. Suddenly Elsa's core erupted with her white steaming cum all over her cheeks and thighs as well as onto Anna's hand. Elsa panted in Anna's arms which remained wrapped around her. Upset with what just happened, Elsa escaped from Anna and went straight for Anna's bathroom. Behind the closed door, Elsa cleaned herself as best as she could. What just happened made her body even more sweaty and it made her night dress uncomfortable to wear. So, she discarded it, standing at the sink before the bathroom mirror. She glanced up at the young woman in the mirror trying to process what just happened. Anna just made her cum. Elsa couldn't hate her sister. Anna wasn't in control of her actions and it was Elsa's own fault for not going back to her own bedroom in the first place. How could she forget about Anna's condition?
Elsa could only hate herself for being so stupid. With her velvet silk nightdress filthy with her sweat and cum, Elsa knew she needed to take her dirty clothes and return back to her room to change into her blue silk night dress before going back to sleep in her own bed. No one else would be awake at this hour so Elsa knew she could quickly retreat into her own room before anyone caught her naked. She quietly went to the door to leave but froze with terror when she heard Anna's voice "Elsa?"
She looked over her shoulder. Anna was still asleep, but it was obvious she was having a bad dream. Tears were leaking from Anna's closed eyes. "Don't be mad. Please, don't shut me out,"
Elsa teared up, forcing herself to leave to get her blue silk night dress, so she wouldn't be naked anymore. She tried to ignore the whimpering of her sister as she had a bad dream, but Elsa loved her sister and quickly returned to Anna to comfort her.
Anna cried in her sleep. Elsa rushed over to comfort her sleeping little sister by cuddling close and stroking her face gently in soothing circles. "Shh. It's okay. I'm here, Anna. I'm- I'm sorry for getting upset at you. I- I didn't mean to shut you out," she whispered as softly as she could but her eyes were leaking tears themselves. "I'll never leave you again. Please…forgive me." Her sister's nakedness was the last thing on Elsa's mind. The only thought that dominated her mind right now was comforting her heartbroken little sister. They remained like that until Anna calmed. Anna was still in deep sleep, not showing signs she was waking up. Elsa found it easier to drift back to sleep. She attributed that to her hearing Anna's inner space wasn't filled with hate for her. Even after what she did, Anna still cared for her and wanted to be with her sister. She felt close to her little sister again knowing that. Elsa turned away from Anna so that she could sleep better since she was getting too hot from her sister's warmth. In the morning, Elsa would confront her sister and ask for her forgiveness, not feeling nervous since she knew Anna still loved her.
All was perfect and Elsa could finally sleep in peace since she had escaped her fears. Being close to her sister again chased away any effects of her nightmare and set her free. Then it happened again. Elsa was stirred from her sleep from some strange feeling in her lower body. As her sleepy mind regained its awareness, Elsa began to panic when she feels the throbbing head of Anna's ten-inch erection barely enter her moist opening. She opens her mouth to speak and put a halt to it. She was able to accept what happened earlier since it wasn't intercourse. If Anna did this, there would be no going back. Elsa had to wake Anna up to stop them from going too far, but feeling Anna's hands groping her from behind. The moment of distraction of this gave Anna the chance to thrust deep into Elsa's warm and wet pussy, making her whimper and gasp in pain. Anna was so big in her tight sopping walls. Even when Elsa pleasured herself, she never got this wet. Elsa refused to accept the strong indication that came to her, that she loved the intimacy of her sister's touch so much.
Elsa strained to pull away from Anna's large member, her inner lips clenched involuntarily at Anna's dick, wanting to keep it inside her. The pleasure of Anna pulling out was so much that Elsa collapsed on top of Anna. Elsa found her voice, "Anna, wake up. You have to wake up. We can't-" Anna grabbed her around the waist and rolled over on top of a squirming blonde.
At the start of the night, Anna's actions under the influence of her mental disorder were gentle and subtle, but each time Anna got closer to Elsa, her actions became bolder and daring. Elsa's shaking hands tried to press against Anna's perky breasts to escape but Anna was stronger as she got between Elsa's legs and repositioned herself at Elsa's dripping entrance.
"Anna, please. Don't do this to me. I need you to wake-" Elsa begged quietly, but Anna's lips crashed into her's, kissing her deeply as she forced her tongue into Elsa's mouth, making Elsa moan loudly into Anna's mouth. Anna began to lick and suck on Elsa's large breasts. One hand squeezed painfully while Anna gripped the other before taking it with a painfully hungry bite. Elsa had to bite her own hand to endure the pain being caused by Anna, but the pain was replaced with pleasure as Anna kissed and licked the place where she bit. Anna rose revealing half-lidded eyes. "Anna?" Anna still wasn't awake, she was acting in her sleep still, but Elsa was fully aware of the throbbing tip of Anna's meaty shaft sitting just inside her inner lips just before Anna slammed into her with all her might.
This was Elsa's first time so the feeling of being filled caused immense pleasure, but it was also painful from Anna's size and intensity. Elsa tried time and time again to speak, but only mewls and whimpers made it past her lips as she looked up at her sister who was roughly fucking her without even knowing it. Elsa contained her screams by biting her hand or burying her face into the crook of her sister's neck. She had to clamp down on Anna's flesh to bare the screams that wanted to erupt from her mouth, but they only came out as muffled, throaty moans.
Elsa could see it was hopeless to resist Anna in her current state. She couldn't wake her up and Elsa knew that she only had herself to blame for her current situation. She was so stupid to remain in here with Anna, but Anna was her weakness. Her need to be close to her sister again was the chains that bound her hands and feet. She was now forever bound to her little sister in a way that never should have been. Elsa gave up, surrendering herself to Anna who continued to fuck her without mercy. Release came for them both. She could feel Anna's balls tighten within her and Elsa's back arched suddenly as her orgasm tore violently from her loins, heating her lower stomach, sending the greatest waves of pleasure she ever felt up to Elsa's head and down her limbs and finger tips. Elsa's greatest orgasm, twice as much as earlier, erupted from her all over herself, Anna and part of the bed beneath them. Next came Anna's orgasm. Her straining meaty member throbbed mightily inside Elsa, spilling a large load of her steaming seed deep inside Elsa. With that, Anna was spent and she collapsed on top of Elsa. With her lips so close to Elsa's ears, Elsa heard Anna whisper something in her sleep. Something she longed to hear. Gently laying Anna down by her side, Elsa smiled with bliss, flooded with joy over what Anna just muttered. She couldn't wait for tomorrow to come so that she could be reunited with her little sister, but for now, Elsa had to help Anna by cleaning up the mess they both made.
(A/N: What did you think? Would you like to see the rest of the story? I got two more chapters if you are interested in reading more. Let me know below.)