Domination

Stacy panted, breathing deeply now that the gag was loosely hanging from her neck. The utter wrongness of her sister's **** put her in a state of shock, but a part of her was enthralled. The invasion which Lina's cock had mounted against her was so rough and fast that she felt suddenly empty. Lina stood and stretched over her, her parasite's dick hung loosely between her supple thighs, slick and glistening with their fluids. Stacy looked her sister over, scanning from her privates up her tight body until their gazes met.

"What?" Lina said, "What the fuck are you looking at?"

Stacy lay on the bed panting as cum dripped from her, she was still gripped by convulsions from her sister's ****. She trembled in a mix of shock and stimulation. Each pulse squeezed more of the sticky spunk from her defiled folds. She was wildly turned on but the worm did not have control over her mind, this was all her. She wanted, no she needed to cum. Stacy looked longingly at her little sister, standing over her triumphantly. Lina tried to interpret the look on her sister's face, but couldn't imagine the thought's going through the ravaged girl's mind.

Then Stacy pleaded: "Please, please let me cum."

Lina smiled ruefully. "do you really think that you can make demands of your master after you exposed her to such a dangerous, mind altering parasite?"

"Please" Stacy begged again

"Please What?" Lina said playfully

"Please, Master"

Lina slowly turned toward the bed. The worm between her legs stirred slightly as Lina stood, legs spread, facing the **** girl strapped to the bed. Stacy scanned her sister again, shakily letting her gaze fall until she stopped on Lina's crotch. Lina was a skinny girl and her taut features were radiant as her sweat studded skin danced in the light. The semi erect worm hung down from the top of her slit, parting her tight pale lips. Stacy shuddered as she caught a glimpse of Lina's perfect ass barely visible behind her stretched legs.

"Please Master, I want to cum. Make me your dirty little whore."

Lina remained still but the worm stirred.

"Please sister, I'll do anything you want, just let me cum."

"Anything?" Lina said as her dick became harder with each word. Her labia began to part as the protruding dick grew, the stretched lips parted for the firm rod.

Stacy became silent as she stared at the bizarre sight. She had never seen her sister naked before the worm. And now she not only looked so sexy but was enthralled by the ample cock growing from her sister's loins.