Elsa dug her fingernails into Anna’s rear, tangling a hand in her red locks and yanking her head hard, attaching her lips to the girl’s newly exposed neck.  She felt her sister squirm underneath her, trying to escape, and Elsa bit the soft skin above her pulse.

“You’re not going anywhere,” she whispered, violently pushing her hips into Anna’s, smirking when the girl’s eyes rolled back into her head and she let out a small moan.  “I knew you wanted this, you dirty little slut.  Now beg me for it.”

Anna’s eyes were wide with fear.  She struggled against the icy bonds encircling her wrists, feeling her fingers going numb from the cold and the lack of blood flowing to them.  “Elsa,” she pleaded, “please let me go!  Don’t do this to me!”

She whimpered when the older girl pushed a cold hand beneath her skirt, shivering as she lightly dragged her nails up the inside of Anna’s thigh.  Anna tried to buck her hips, desperate to push her sister off.  Elsa growled, jerking her hand away from its intended destination, and grabbing the younger girl’s jaw roughly.  “Be still, or I’ll hurt you.  And we both know I don’t want to hurt you.”  She grinned wickedly, loosening her grip slightly, tracing Anna’s lips with her thumb.  “Much,” she winked.

“Just relax, Anna.  It’ll hurt less,” she hissed, trailing fingertips down the girl’s neck, over her collarbone and between her breasts, until they met soft fabric.  Clenching the bodice of the dress in her fist, Elsa tugged harshly at the material, and Anna heard the seam at her side rip apart, exposing her chest.  A tear rolled over a freckled cheek as she closed her eyes, trying to force her mind to drift somewhere else.  Anywhere but here.

Perfect white teeth embedded themselves in the creamy flesh of her right breast as Elsa bit her, swirling a rough tongue over the nipple.  The sensation made Anna groan, and shame flushed her cheeks as she felt herself growing wet.  She couldn’t help but glance down, finding her sister looking at her with a dark gaze nothing short of predatory.

Elsa released her breast, untangling her hand from Anna’s hair and scraping her nails lightly down the sensitive skin in the valley of her chest, before attaching her lips to the girl’s left nipple, hand still trailing a heated path down the fabric covering her taut stomach, until it reached the hem of the skirt bunched around her waist.

Elsa sat up slightly, baring her teeth.  “Be a good girl for me now, Anna,” she ordered, cupping Anna’s wetness through the silk of her bloomers, grinning when the younger girl’s hips bucked into her hand.  Elsa watched her try to fight her arousal, jaw clenched and eyes squeezed shut, crying openly.

The older girl pushed a hand past the waistband of Anna’s bloomers, sliding a finger into her sister’s slick folds.  The girl sobbed, hips jerking, her body seeking further contact but her mind desperate to get away.  Elsa circled her fingers around the small bud she found, basking in the pleasure her sister’s desperate whimpers gave her.

Pulling back, Elsa lifted the finger to her lips, pulling the digit into her mouth with a contemplative hum.  “You taste sweeter than I imagined,” she said, fixing her sister with a dark gaze.  “You’ve never been touched like this before, have you?”

Anna’s only response was to choke on a sob as she tried to wriggle free.  “Don’t- please, stop!” she cried.  “I’m your sister, Elsa! Please don’t do this!”
A devastating backhand was the younger girl’s reward, the crack reverberating off the wooden floor. “You shut your fucking mouth,” her sister snapped, pressing a hand to Anna’s lips, shoving the other back under her bloomers.  The girl’s screams were muffled, but Elsa revelled in the sounds all the same, feeling Anna’s hot breath against her palm as the girl fought the waves of pleasure coursing through her.

Elsa leant down to taunt her sister, hissing into her ear.  “Just let it go, Anna.  Let me show you how good it can feel.”  The girl shook her head desperately, biting Elsa’s hand, drawing blood.

The older girl yelled in pain, backhanding Anna again, before yelling, “Fine!  You won’t stay quiet?  Then I’ll give you no choice!”  Conjuring an icy gag to cover her sister’s mouth, she forced two fingers inside of her, pushing one of the girl’s thighs against the cold, wooden floor.

Taking up a steady rhythm, Elsa attached her lips to Anna’s shoulder, biting down hard, marking the girl and making her writhe with equal amounts of pleasure and agony.  She could taste the salty sheen of sweat on Anna’s skin, and the girl’s chest was rising and falling rapidly as Elsa brought her closer to the edge.

She grinned down at her sister maliciously.  “Don’t deny me, Anna.  I can feel how close you are.  Let me take you all the way.”  Elsa exhaled with bliss as the girl’s cries became ones of pure desire.  Her need to escape was quickly being smothered by the raw desperation she had for her tormenter to make her come.

“Elsa.  Please!”  she begged, no longer aware of what exactly she was pleading for.  The older girl roughly palmed a breast, sucking at the sensitive skin of her sister’s neck as she hungrily pushed deeper and deeper into Anna’s wet heat.

Suddenly, the girl stiffened beneath her, back arching as she inhaled sharply, and Elsa felt her sister’s walls pulsing around her fingers as a groan was torn from her throat.  She flicked a finger over Anna’s nipple, succeeding not only in making the girl shudder, but also removing the ice that covered her mouth.

“Elsa!” she gasped, throwing her head back as waves of white-hot pleasure crashed into her.  “Oh god!”  Anna crashed back into her surroundings when Elsa jerked her fingers away, forcing them into the younger girl’s mouth.

“Clean up this mess you made,” she taunted, almost making her sister gag with how deep she was pushing them.   “And thank me for what I gave you,” she growled, wiping her hand on Anna’s torn dress.

Anna’s cheeks glistened with tears, eyes red and voice lost.  She stared up at Elsa imploringly, but the older girl only narrowed her eyes, pushing herself into a standing position.  “You ungrateful little…you can find your own way out of here,” she said, stalking over to the other side of the room, leaving her sister broken and bleeding in the darkness.