"We can’t, Mistress, not here.” Jake pleaded with a whining note, breathing out heavily, as Leah made a daring, groping move towards his crotch.
They were in a relatively quiet section of the college library and had been kissing passionately for several minutes now. While part of Jake, the submissive slut side of him, loved the idea and risk of continuing, he knew that it would only be a matter of time before they were discovered, and the rational side of his brain or at least what was left of that side of him after several minutes with Leah, knew that getting caught here would be a very bad idea.

Leah pulled away reluctantly. “You are right, of course. Which is a shame for you, my pet.”
Jake groaned, didn’t he know it, this was the fourth day Leah had forbidden him to cum for, and with all her constant teasing, he was finding it very difficult to focus on anything else other than how unbelievably pent up and frustrated he was.
“I’m coming over this afternoon, slut, and you can cum then but not before, and not until I say so.”
“Yes, Mistress.” Jake replied quietly, his voice shaky. That was fine with him, given their various lectures, that would give them an hour or two before his younger sister came home, and several hours before his mother returned. And at least he would finally be able to cum, he thought wistfully.

In truth, Jake couldn’t really understand how he had fallen under Leah’s spell. Lieth and lean, with flowing, brunette hair, Leah was the captain of the cheerleaders and every bit their leader. Jake, well, if he was honest, he was a nobody, he was under no illusions on that part, but somehow, he was dating Leah. Well, dating might be stretching what they were doing, and Jack knew that Leah wasn’t exactly monogamous, but Jack really couldn’t find another way to explain it, especially to his mother and sister. Leah had suggested that he could always tell them that he was her current favourite sub pet, but Jack had chosen not to consider that an instruction and had really hoped she had been joking.

---

“Hi, Lily, what are you doing back so early? Not skiving off or something, are you?” Leah asked as she stepped into Jake’s house and immediately saw his younger sister washing a glass up in the kitchen sink.

Leah took a moment to examine Jack’s cute younger sister, who, tongue-tied, had stopped in the middle of the kitchen as if frozen and blushing profusely. She possessed the same jet-black hair that her brother did, but it was longer and a lot better kept. The darkness of her hair seemed to make the ocean blue of her eyes pop and sparkle more than they would have otherwise. Both of those colours contrasted wildly with the pale white of her skin. Leah couldn’t help but be drawn to Jake’s sister, ever since the girl’s 18th birthday a couple of months ago, Leah had been fantasising about the innocent girl. Yet in a rather uncharacteristic move, Leah had never made any move to bring her fantasies out of the realm of thought that they resided in.

Leah didn’t do innocents, she liked to find those who had already broken emotionally, those who were looking for what only she could provide. Like Lily’s brother, broken, perverted and horny. So desperate that none of them could resist Leah for long. Despite how much Leah fantasised about breaking Lily’s innocent little mind bit by bit, she would never do it. Lily deserved a chance to find her own much more innocent and purer path through life. To come apart in the embrace of someone who loved her, not brutally and completely on the end of Leah’s strap.

In one way, though the siblings were completely the same, Leah reflected, they were both mega nerds. You didn’t have to look much further than Lily’s rectangular glasses and the books that she almost always had within arm’s reach to know that if anything, Lily was even more of a nerd than her big brother.

Lilly stood staring back at Leah, blushing profusely, she didn’t know exactly why, but it was always the reaction her brother’s cheerleader girlfriends had on her. Lily wondered again what the attractive blonde could possibly see in her plain and rather boring brother. It simply baffled Lilly, her brother, and this goddess should have been from two completely different worlds, and yet, they were dating and had been doing so for several months now.

“No… No… Of course not!” Lilly finally stammered.
Leah shrugged her shoulders as if to say that it wouldn’t matter to her if Lilly were.
“You do you, girl,” Leah said as she left the room, going upstairs to find Jack. She had a sub slave to fuck, after all. It didn’t do to keep the horny waiting, not unless it was on purpose.

Lilly groaned for the hundredth time and desperately tried to turn her earbuds up higher to drown out the noises that she didn’t wish to acknowledge, let alone hear. She fought the embarrassment and sick feelings those noises sparked in her, but worse was the small part of her that wanted to hear those noises that got turned on by the endless groans, moans and wet slapping sounds.

Worse was how long this torture seemed to go on for. Lilly tried desperately to stay away from rumours of this sort, but she had heard that this kind of intimacy was supposed to be quick, but this torture, this was never quick, this was a long, drawn-out hell that could last anywhere from an hour to two or even three hours.

Lilly wanted nothing more than to be anywhere else, but she settled for her headphones and being downstairs at the opposite end of the house. Lilly really didn’t want to get any closer, she really didn’t want to go upstairs, but she was beginning to have no choice. She was getting more getting more and more desperate for the toilet, and that would mean going upstairs. Lilly squirmed again, hoping she could hold it until they were done, but it was clear her bladder had other ideas.

If Lilly’s headphones weren’t quite enough downstairs, they were next to useless up here. Lilly tried desperately to get done quickly enough that she wouldn’t be scarred for life, or, as she felt another throb pulsate through her core, so turned on that she did something that she would regret forever.
“Yeah, ride it bitch, you like my cock, don’t you slut!?”
“Oh, yes, yes, mistress!” Please fuck me, mistress!”
Lilly couldn’t suppress the shudder that ran through her, nor the intrigued thoughts she was having at hearing those words. Especially at the name her brother had just called Leah, it reverberated around her mind with all of its dirty and depraved connotations, ‘Mistress’.

Before Lilly could even think, could even help herself, she was walking towards her brother’s room. The moans, mostly from her brother, got louder and louder and louder with every step. Lilly wondered what she was doing, she didn’t want to see this, to hear this, did she? A shudder ran through her body, emanating in the slickness of her core, she certainly couldn’t be turned on by this, could she? No, that would be wrong, so wrong.

As Lilly approached the door to her brother’s room, she let out an audible gasp and her hands came up to cover her mouth in disbelief at the scene in front of her. A scene so hot and so wrong that Lilly could not look away. Something that Lilly would never have thought she would see in a million years, and something that Lilly would never have thought she would ever want to see.

Jack lay flat on the bed, his back arched just as his Mistress liked. She was behind him, and he could hear the telltale click of the top of a bottle of lube. Jack hated and loved what that sound did to him, it was followed by a sound that did even worse things to him, the wet slapping of lube, flesh, and harder rubber of a ridged dildo. Jack tensed, waiting for the pain and the pleasure.

Lilly couldn’t believe what she was seeing and the way she was feeling. She stared wide-eyed at the huge black cock protruding from Leah’s crotch. It was massive Lilly had a general idea of male anatomy, and she wasn’t quite so much of a virgin that she had never watched porn, but this was so big, there couldn’t possibly be real dicks that big, right? Lilly couldn’t help but fantasise about Leah using it on her, splitting her virgin sex open with just a single thrust. It was in the middle of that fantasy that Lilly’s eyes grew even wider as she realised what was about to happen. Was Leah really going to bury) that monster in Jack, no, she couldn’t be, it would have split her open, let alone. No, it would never fit in there.

Leah let a hint of a smile twinge her lips when she saw the figure in the open doorway. She should have known that Lilly would be a little slut as well, given how much of a submissive pet her brother was, such a submissive, perverted slut. It was probably quite unlikely his little sister would be the perfect angel she seemed to be, for more likely that she would be a perverted slut as well. Yet Leah was, in all honesty, slightly surprised, Lilly always seemed so innocent and Leah was at least ninety percent sure that was not an act.

So, the innocent little slut wanted to watch, well, Leah was fine with that. She would just give that voyeuristic cutie a show that she would never forget. Who knows, Leah was confident that she could, if Lilly enjoyed this enough, have Lilly as her lesbian pussy pleaser before she knew it. Leah took just a second to enjoy that thought, to wonder what Lilly’s tongue might feel like lapping at her slick slit.

Then Leah let the thought go and focused back on what she was doing. Leah adjusted her positioning slightly, just enough to give her audience the best view possible. Leah wasn’t willing to admit that she made any other changes to accommodate the voyeur in the doorway, ok fine, she might, that is to say, might have, spent more time rubbing lube onto every inch of her strapon’s length in an enticing way. But really, it wasn’t her fault if that perverted voyeur decided to watch, and it certainly wasn’t her fault, if what Lilly saw made her cunt wetter than the ocean, which Leah was pretty sure, it would be.

Leah couldn’t resist her own perverted nature or her need to play, as she speared forward to take Jack in one fluid motion. Leah could not resist a glance at Lilly, who still stood bug-eyed in the doorway. Meeting Lilly’s eyes, she gave a conspiratorial wink before she refocused her efforts on Jack.

Lilly’s heart stopped when Leah winked at her, she had been spotted. Fear overtook her, but strangely only made the almost painful throbbing of her sex worse. Seeing her own brother getting pounded was the hottest, most perverted thing Lilly had ever seen. It wasn’t incest, was it, if she was mostly fantasising about her brothers' ridiculously hot girlfriends?

Whatever it was, Lilly had never been this horny and wet. The sensible, rational, reasonable voice in her head, that was rapidly becoming little more than a whisper, appealed to her morality. She should stop watching, she should never have started watching in the first place. Lilly knew all of this, and yet she couldn’t pull her eyes away from the beautiful, dominant cheerleader who was fucking her brother relentlessly and mercilessly. Nor could Lilly force her legs to let her leave. She remained rooted to the spot, watching like some creepy peeping tom getting more and more horny with every slapping, squelching thrust of that Goddess’s hips and every moaning cry from her brother, when the dildo buried deep inside him was pulled back or sent racing, spearing forward.

“You’re a slut for my strap, aren’t you?” The question was open-ended, but Leah had turned her eyes from Lilly’s brother’s body and back, and was staring into Lilly’s lust-glazed eyes as she spoke.
“Yes, Mistress.” Her brother answered for her, groaning as he did so.
Lilly’s thoughts were broken for a second by Jack addressing Leah as Mistress; it sounded so demeaning, controlling, so wrong. Like Jake was demeaning himself, like he was Leah’s slave. Lilly didn’t like it, it totally went against her liberal view of the world. For that matter, Leah’s use of the word slut wasn’t something Lilly agreed with. Yet Lilly couldn’t dismiss the part of her that had gotten even hornier at Leah’s words.

Lilly couldn’t dismiss the part of herself, a part of herself that she hadn’t known existed until now, that wanted to shout yes, Mistress at the top of her lungs and give herself over unto her brother’s girlfriend here and now, right in front of him. Lilly was so overcome by lust and other emotions that she couldn’t ever name to care about anything right now. Leah seemed to know this because the strapon still deeply ebbed in Jack, who, himself, had been reduced to a whispering, groaning, pleading, pleasure pet, once again looked deeply into Lilly’s eyes.

This time, Leah mouthed something, something that Lilly only just got, and because she had chosen to mouth it instead of saying it out loud, Lilly was immensely grateful and relieved. At least for the moment, it seemed that Leah intended to keep her perverted presence secret from her older brother. Lilly also felt a certain amount of release, not exactly sexual release, she was still every bit as pent up as she had felt before, but at Leah’s instruction, her hands quickly moved to obey Leah’s command. It was as if Leah’s command removed all the responsibility from her actions, allowing her to do just exactly what she wanted without worrying, that in itself was as unnerving as it was exciting and agitating.

Tentatively at first and then more forcefully, Lilly’s hand disappeared into her pants, pushing aside her panties and lightly gliding through her ultra slick heat. In an attempt to follow her Mistresses. What, no… Leah’s instructions as best she could. Lilly had no idea where that thought had come from, but didn’t have the mental space or concentration to really think about that right now. Lilly’s mind went more and more blank as the pleasure took hold, and the only thing she could properly focus on was not moaning out in sheer pleasure.

Lilly knew is she moaned, just once, then her brother would know she had been here watching. Lilly couldn’t handle the embarrassment of that, so despite the unbelievable pleasure, she clenched her jaw shut against it. Her hand was working at her crotch furiously now, in time with Leah’s savage thrusts and her brother’s loud, throaty moans.
"Don’t you dare cum until I tell you to!” Leah yelled, and Lilly instinctively knew it was for both of them.

Lilly wanted to rebel against Leah, waited to tell the older girl that she couldn’t dictate what she did with her body, but instinctively, she found that she couldn’t. Her body ached, yes, yearned for the orgasm that had built within her, but for some ineffable reason Lilly couldn’t do it. Her body needed Leah's permission to release. Her eyes wide with desire and dismay, locked on Leah’s, the smirk and finger wag that she received had Lilly more annoyed than her pent-up orgasm. She wanted to throttle the older girl with her bare hands. At least she thought she did, but when she tried to mentally picture it, she couldn’t make the scene play out like that. Instead of her hands around Leah’s neck, it was she who was flat on her back, Leah above her, Leah’s hands lightly but firmly around her neck. Lilly could almost feel the ghosts of Leah’s imagined grip, and then the frustration came again. The hot fantasy had once more brought her to the brink, but something in her brain knew she couldn’t cum just yet and had stopped her from getting out there.

What seemed like an eternity passed for Lilly in this way, unable to orgasm but so close it, that it was taking her breath away. Leah was loving every second of it, she was almost drunk on the power of it. The two cheeky siblings at her mercy. Completely under her control. Both unable to cum without her say so. Leah had never felt so much power, and she was in an abhorrent, pent-up state just from the sheer domination and submission of it all. Leah, who rarely came purely from being the one using a strap like this, could almost feel her own orgasm bubbling just below the surface. This was seriously hot. Leah had never even truly considered having sibling pets before, nor had she thought that Lilly was as submissive as her big brother, but right now she was proving that she was every bit the submissive pet that he was. Almost delirious with the power and dominance she felt, Leah told them to cum for her.

Obedient as always, Leah felt Jack clench down on the dildo deep inside him, and then the room was filled with his guttural moans as the long-awaited orgasm finally overtook him. But Leah’s eyes and attention were elsewhere, with the uninvited voyeur in the doorway and the hilarious and yet sexy spectacle that was Jack’s cute, geeky, adorable sister.

As her orgasm, finally released, ripped through her body, Lilly almost blacked out with the force of it. She only just kept the vital presence of mind to stuff the collar of her top into her mouth. In order that she didn’t cry out too much.

The force of her orgasm brought Lilly to her knees, she tried to cling onto the doorframe, but all that did was cause her to fall forward more dramatically. She lay there, in a pool of her own sticky juices, which had long since escaped through the crotch of her pants. Lilly’s pants had, in the course of her masturbation, been pulled even further down her legs away from her dripping crotch and now were bunched around her knees.

Lilly tried desperately to recover quickly because she recognised that she was extremely vulnerable right now. She was totally exposed and visible, her perversion completely on display. Lilly would have liked to run away and hide from what she had done, but the orgasmic aftershocks racking through her body made that impossible. Right now, Lilly questioned if she could even stand, let alone run away.

Jack, in a similar state to Lilly, was recovering much quicker, with a squelching noise that seemed to go on for a considerable amount of time, Leah pulled the strap on free of Jack and began unbuckling it. Only then did Jack turn his head, his eyes widening as he took in his sister’s half-naked form, the implications obvious. Only then did Lilly realise she was too late to escape unseen.
“Ah, so you have just noticed our uninvited guest.” Leah’s glee at this situation, indeed, at Lilly’s ever-growing embarrassment, was obvious.

For feeling the burn of her brother’s incredulous eyes travelling her partly exposed body, Lilly quickly pulled her pants up to hide her body. Her pants, while making her halfway modest and at least covering her nakedness, did little to hide her shame. There was a visible wet patch at the crotch, very visible in the pink jogging pants she was wearing. A testament to her perversion, which only made Leah grin broader.

Lilly turned to leave, her head down in shame at her unthinkable actions.
"Did I say you could leave. Turn back around.” Leah’s voice was clear and commanding.
Lilly, brain now more rational than it had been, could not understand why she obeyed the words. For all her beauty, and however much Lilly had a crush on her, Leah was not in control of her, nor was Leah superior to her in some way. Lilly told her so now, clearly, telling Leah out loud that she wouldn’t follow any more of her commands.

Lilly was acutely aware, however, that her actions had made a mockery of her own words. She had turned around on a dime and was now facing Leah, her brother’s eyes still glued to her. Leah’s rye amusement was all the answer Lilly got.
“On your knees, pet.” The command was firm but not unkind.
Lilly refused, though for some strange reason, she wanted to obey badly. But she didn’t, she remained defiantly standing.
“Come on, pet, don’t be disobedient. Did you enjoy what you saw?”
Lilly’s cheeks were red, she wanted to deny it, but Leah’s eyes were boring right down into her soul, and it was a moot point anyway, after all she had done, everyone in this room knew that she had.
"Yes. She squeaked quietly.
“Louder.” Leah told her with a savage smirk.
“Yes, what?”
Lilly almost groaned. She had a nasty feeling she knew exactly, while Leah wanted to hear.
“Yes, Mistress.” Lilly announced, trying to ignore and not to feel the weight of those words.
“Good girl. Kneel.”

Lilly figured she didn’t have much to lose at this point and did so. She should be disgusted in herself, she should be standing up to Leah, literally and figuratively, but instead was obediently following Leah’s every command like a puppy. Lilly really couldn’t understand why. Every bit of this was the sort of demeaning bigotry that Lilly hated with a passion, and she mostly associated with men, yet here was a woman revelling in it far more than any man Lilly had ever seen. The even more baffling thing to Lilly was that thing she couldn’t help but feel this warmth in her soul at being given instructions like this. Lilly also couldn’t help but feel the heat in between her legs every time she was called pet.

“Good girl, my pet. You may leave now, if you wish to. I imagine for a change of pants and parties.” Leah told her eyes pointedly glancing at Lilly’s parties laying, sodden and abandoned in the doorway.
Lilly realised instantly where her mistress, no Leah, never that, she had to keep that straight in her head, was looking. Lilly immediately and abruptly raced over to retrieve her abandoned panties.
“Leave them, my pet, I might want them later.”
Lilly did as instructed, cheeks redder than ever at the not at all subtle implication, raced out to the room, leaving her parties where they lay.

****************************************

As soon as her own door was shut behind her, Lilly gave a low, strangled sigh. She couldn’t make sense of any of what had just happened, nor what she had done. Her own feelings were a tempest that she herself couldn’t begin to process. Should she be disgusted with herself, probably, but she really couldn’t be sure anymore. Was what had happened wrong again she wasn’t sure. Incest was regret was wrong, and she and Jack had seen each other nude, that was wrong. to say bad. She had watched Jack get fucked, surely that was wrong, but she and Jack hadn’t actually ever touched, so was that incest or not, Lilly wasn’t sure.

Another thought presented itself to Lilly. Was she gay? Throughout the whole thing, she would freely admit that Leah had been the real focus of her sexual thoughts. Before any of this she had would have admitted she had a girl crush on Leah, did she actually have a genuine crush on her. Was she a lesbian for Leah, she wasn’t certain. Lilly wasn’t certain about much at the moment.

After a while and a change of outfit Lilly worked up the courage to go down stairs. She knew that would have to face everyone and what she had done sooner or later and anyway their mom would be back soon.

Lilly found Jack and Leah curved up together on the couch in the living room. Lilly made her way over to one of the two chairs a little distance away from them and sat down. She and Jack strategically avoided eye contact with one another. Leah blew a kiss over to her, making Lilly roll her eyes.

After a few more minutes she curled up caressing, Leah made as if to get up. Jack started to get up to show her to the door but Leah stopped him suddenly, telling him that Lilly could show her out instead. Jack wasn’t sure what to make of that until Leah silenced any objections he may have had with a passionate kiss.

Lilly for her part got up quite reluctantly, she was just as embraced to be around Leah as she was to be around her own brother right now, and she had a feeling that Leah had some nefarious reason for wanting Lilly to accompany her. Still Lilly wasn’t sure how she could refuse, so get up she did.

They were in the hall by the door before Lilly’s prediction was proven true. Leah halted abruptly and turned to face Lilly.
"I know it’s tempting for you to pretend that what you discovered about yourself today didn’t happen. Don’t.”
Lilly was about to reply, but she wasn’t even done framing her denial of both a discovery and denying it in her head before Leah’s finger brushed lightly against her lips making her heart beat faster than Lilly knew it should.
"Don’t I can already see the denial in your eyes. But I know what you felt and you know what you felt. There is no putting that genie back in the bottle so don’t bother.”

“Oh, so what did I learn?” Lilly snarked, finding her voice at last.
Leah smirked, wagged her finger and leaned in closer.
“That you’re a submissive lesbian pet and a massive pervert.” Leah answered in an almost imperceptible whisper, just inches from Lilly’s ear.
Drawing backwards, Leah judged the scowl, on Lilly’s face.
“Fine, don’t believe me. I will give you proof.”
Then, unexpectedly, Leah’s forefinger and index finger met gently kissed Lilly’s lips.
“Suck, pet.” Leah’s voice was quiet but commanding, slightly deeper and more guttural than her ordinary speaking voice.
Lilly reacted instantaneously her mouth opening almost involuntarily to engulf the two digits. Leah smirked gloatingly.
“You may stop, my pet. See what I mean, you just can’t help yourself. There is nothing to be ashamed of.” Leah told her firmly.