As Amanda walked towards the bathroom, she felt a pair of eyes closely watching her every move. With a mischievous grin, she managed to turn around and see her own brother standing with a guilty look on his face. His eyes darted quickly between her and the dirty pair of scanty black panties in his trembling hands.
"You naughty little brother, spying on me, huh?" Amanda teased, sauntering over to him. She playfully snatched the panties from his grip and held them up for him to see. "I think it's only fair that you do as I say now, don't you agree?"
Her brother couldn't speak, his mouth hanging open as he watched his sexy older sister slowly removing the remaining scrap of fabric between her thighs. Amanda tossed the panties carelessly to the side, revealing a lacy thong still attached to her slender hips. She could tell it was driving her brother wild seeing her naked, even if it was just for a moment.
"Now then, I have a little task for you," she purred, putting one hand on her hip and wagging a finger at him playfully. "You're going to clean my panties with your mouth... and appreciate every second of it."
Amanda stepped closer, invading his personal space, and lowered the scanty thong to her ankles. The wet spot between her legs glistened in the dim light as she let it slap against the floor, daring him to resist. Her brother couldn't believe what was happening but couldn't seem to find the strength to refuse his sexy sister.
"And when you're done with that," she continued, grinding her hips against his rapidly hardening crotch, "you'll have the pleasure of watching me take a nice, hot shit."
The sight of his sister's perfectly round ass in the air, her thick thighs parted to expose her intimate folds, was almost too much for him. He hesitantly lowered his face towards the soiled panties, his nose twitching at the strong smell of her arousal. Amanda giggled in delight as he began to sniff and lick at them.
"You like that, don't you, bro?" she asked, her voice no longer playful but rather laced with the sweet anticipation of power. "You've been secretly fantasizing about smelling and tasting your sister's used panties, haven't you?"
He didn't answer, too caught up in the thrill of the forbidden act. As he cleaned her panties with his eager tongue, he couldn't help but grow even harder, the heat between his legs impossible to ignore. Amanda took this as her cue to start stripping out of her remaining clothes, revealing her perfectly lithe body glistening with sweat.
"Look at you," she purred, running a hand over her flat stomach and leaning in to kiss him tenderly on the ear. "You're so turned on by your own dirty sister."
She turned around, presenting her tight ass to him, and released a slow, steady stream of hot, steaming poop onto the cold bathroom floor. It sizzled and popped as it hit the tiles, filling the air with a nauseatingly sweet aroma. Amanda moaned softly, the weight of her bowel movement causing her to sway slightly from side to side.
"Now, it's time for you to taste your sexy sister's shit," she said softly, her voice almost hypnotic. "Start by eating up all the poop that came out of my ass."
Her brother couldn't believe she was asking him to do such a disgusting thing, but the look of pure lust and desire in her eyes made it impossible to resist. He stared at the pile of fresh poop on the floor, his heart racing with anticipation and fear. Amanda giggled again as she watched him struggle with himself before finally succumbing to her command.
Slowly, with shaking hands, he lowered his face to the ground and started licking at the warm, squishy poop. It tasted even worse than it smelled, but he could feel a strange sense of satisfaction wash over him as he did as his sister asked. Amanda watched him for a few moments before stepping away, giving him some space to finish.
"That's a good boy," she purrs, her voice full of pride and amusement. "Just remember, from now on, your sexy sister will always have complete control over you. You'll do whatever she wants, no matter how filthy it is."
With a final smile, Amanda turned and walked back towards her room, leaving her brother covered in his own shame and desire. He didn't know what had gotten into him or his sister, but he knew one thing for sure: he would do anything to keep satisfying his newfound twisted desires.
