Sam gets caught

Sam stood completely naked in the middle of her bedroom, one hand working away furiously at her crotch. Her knees knocked in against the ungainly trembles reverberating out through her body from that point of contention. Her bottom lip bitten seductively as she stared down her own reflection, and whatever unknown figure truly stood in control behind those eyes.

Her clitoris ached from the roughly-targeted friction it was receiving… but also with wave after wave of building pleasure. It was an utterly galling way to approach an orgasm: Dragged there inch by inch upon the clumsy effort of one's own fingers, but at the behest of someone else. Someone who presumably hid behind those same eyes she was looking out from, playing with themself as well in some faraway room.

Still, it was before that rapidly-approaching target could be hit… that another sound reached Sam's ears over that quietly rhythmic squelching. The sound of footsteps along the passage outside. It was nearing midday on a Sunday, anyone in the household could be about. Yet, here she was, placed in the most compromising of positions by some outside influence who surely neither knew nor cared what happened to her. Please, please let whoever it was just pass by, her inner monologue begged. Desperately unable to cease this unsuitable action in full view of the door to her bedroom. Please just let this torturous, humiliating scenario end with her climaxing in privacy and never having to think of this again.

Such luck was ever just a pipe-dream though. The plodding footfalls stopped directly outside the unlocked portal to her shame. The handle turned and door pushed open in such an unthinking manner that Sam knew immediately who it was: Her older brother barged into the room without a second's thought for any ideas of privacy the teenage girl might crave. Normally, this might drive her to indignant fury. Today, it led only to mortifying horror.

Kyle froze in the doorway. Whatever inane, teasing statement he had been about to unleash, stolen from his lips. Poking fun at her for spending all morning lazing around in bed was one thing… walking in on her, naked and in mid-masturbation was a whole other. The constant battle of sibling rivalry just hadn’t been prepared for such a momentous occasion of embarrassing ammunition today. Sam turned to face a slack-jawed and bewildered-looking boy staring at her as if he'd never seen such a sight in all his life.

Her inner self had already run screaming toward the bed covers. Barking in incandescent rage for her sibling to leave her room and never come barging in like that again! However… her actual, physical self barely batted an eyelid. She stood smiling at him with a warm and welcoming grin, her nubile body on full, open display. That one hand between her legs not pausing in its work for even a second, while the other had reached up to cup and massage one of her breasts.

"S-sis?!" Her brother managed to stammer, at last. His eyes glued wide to every inch he could see of her, apparently unable to tear them away for an instant.

"Oh… H-hey bro." Sam heard her own, panting voice emerge, seemingly trying to sound unabashed and nonchalant despite all the physical reactions racing through her body. Also confirming for the first time that whoever it was pulling her strings could make her speak as well. A further level of nightmarish control.

As her brother fled from the room without another word… It truly struck Sam just how much damage this invader wearing her skin could do, given how much access they had to everything that made up who she was. It might be embarrassing beyond belief to have been caught openly masturbating by her sibling… but what else did this mystery puppetmaster have in mind for her? The girl's fears began to transmute from the simple bodily shock of having a stranger take command of her limbs… toward the far greater worries of what they might do to her life, reputation and relationships.