She tells me one of Amanda's deepest secrets

I slide my fingers deeper into Cathy's wetness with a deliberate slowness, feeling her cunt clamp around my invading digits. She throws her head back slightly, her mouth falling open as I bend my fingers inside her mimicking the well-known come here motion, pressing against that sensitive spot just inside her walls. Her hand flies to her mouth to stifle a moan, but a high-pitched whine escapes around her fingers anyway. The movement of my hand is more obvious now, my wrist twists slightly as I work my fingers in and out of her. Cathy's hips push back against my hand instinctively, her thighs quivering as she tries to maintain some semblance of control.

I lean over and kiss Cathy.

The moment my lips meet Cathy's, she surges forward, her tongue sliding into my mouth with **** hunger. Her hands reach up to my face, holding me in place as she devours my lips, her body pressing against mine with urgent need. I can feel the heat and need radiate off her body as she slowly grinds up against me. Her teeth graze my bottom lip before she pulls away, gasping for air. She's so turned on now that her entire body trembles, her wetness coating my fingers as I continue to pump in and out of her. Her eyes dart over to Amanda, who has gone completely still except for the subtle movement of her hand beneath the pillow.

I drag Cathy onto my lap, with her facing me, and start massaging her ass cheeks through the thin nylon shorts covering them. Her shorts hike up around her thighs as I keep rubbing her behind. She settles down on my lap as soon as my hand lets go off her, her hips grinding down against mine. Her wetness is now soaking through her clothing, and i can feel a wet stain on my pants leg where she is grinding against me. Her hands grip my shoulders, nails digging in slightly as she moves. "That's it, baby," I say with ragged breath, sliding my hands back to her front to squeeze her tits through the fabric of her shirt. "Put on a show for Amanda." Cathy lets out a breathy laugh at that, tossing her hair over her shoulder. She arches her back slightly, pushing her tits forward into my greedy hands as she grinds harder.

As Cathy is grinding on top off me, her earlier whispered words are swirling round in my head, my brain working in overdrive how to put that information to use “You know, once when we got drunk, Amanda told me how she would love for a guy to take control of her. Dominate her. Punish her. Use her however he sees fit.” Could i really do that? To Amanda? My stepsister. My bratty, obnoxious, stupidly sexy stepsister, who no was sat just an arms-length away masturbating to me and her best friend?

I kiss Cathy hard, pushing my tongue into her mouth. Cathy moans into my mouth at the surprise intrusion, her body still grinding against mine. The taste of her mouth is sweet with the faint mint of gum, mingled with the heat of her arousal. Her hips roll against mine, the wet spot on my jeans no doubt growing larger as she rides against my growing erection. When we finally pull back for air, her lips are swollen and glistening. "Fuck, you're good at that," she breathes, her fingers trailing down my neck. She glances over at Amanda. The pillow have slipped from her lap. Her hands are still not visible, but now they are instead hidden beneath the waist band off her sweatpants.

My mind made up, I look over at Amanda. "And what do you think you're doing?" I ask with a stern voice.

Amanda freezes, her hand stilling instantly as she meets your gaze. Her face flushes deep red, but whatever shame her expression should portray is burried by a raw hunger. She bites her lower lip, her eyes darting from you to Cathy and back. "What I'm doing?" Amanda repeats, her voice higher than usual. She slowly pulls her hand from beneath her pants, letting us see her glistening fingers. "I'm... I'm enjoying the show, clearly." Her attempt at defiance falters as she licks her lips unconsciously. Cathy's breathing hitches at the display, her body still pressed against mine. She watches Amanda with equal parts amusement and arousal.

"You've treated me like dirt ever since you and your mother moved in, and now you think it's okay for you to get off watching me? Don't you think I deserve an apology for your bratty behavior first?"

Amanda's face pales slightly at the words, her fingers curling into the couch cushions. For a moment it looks like she might actually apologize, but then defiance returns to her expression. "Oh please," she scoffs, though the effect is ruined by the slight quiver in her voice. "Like you haven't enjoyed been glancing at me even with my hot friend on top off you." She gestures between Cathy and me. Her challenge remains in her eyes, but her body betrays her. Her thighs press together, and her hard nipples presses through the fabric of her shirt. She's trying to play it cool, but her quickened breathing and dilated pupils tell me everything I need to know.

"Yes, but me and Cathy are both consenting to what we are doing. I don't remember either of us giving you permission to fingerfuck yourself watching us"

Amanda flinches slightly at my words, her face burning with embarrassment at the crude words. But behind her exterior there is a flicker of something else, arousal. She parts her mouth slightly, chest rising and falling rapidly. The challenge in her expression wavers. "I don't need to ask permission, this is my home too.” She tries to sound confident, but her words come out without any power behind them.” She shifts uncomfortably on the couch, pressing her legs together. Cathy, still straddling me, turns her head to look at Amanda. I can feel her fingers brushing down my side, the motion suddenly more deliberate as she waits for me to respond.

"If you can’t behave around us, I guess me and Cathy have to continue this in my bedroom then. With locked doors.”

Amanda's face shows surprise as I stand up with Cathy still wrapped around my waist. She scrambles to her feet, moving closer. "Wait" Her hand catches my arm, her fingers digging in slightly. Cathy tenses in my arms, her own arms locking around my neck to keep her in place, as she watches the interaction with rapt attention. "Don’t go upstairs..." Amanda's voice trails off, then she squares her shoulders. "I'll behave. I promise." The way she says it ,husky and ****, sends a thrill through me. I can sense i got her exactly where I planned. Cathy shifts against me, her teeth nibbling at my ear. "You sure about this, baby, she did dare speak back to you."

"I don't know,what do you think. Should we let her watch?"

Amanda gasps audibly at my words, her hand still clutching my arm. Her face flushes darker, burning with a crimson hew. Her body shakes involuntarily as a full-body shiver runs through her. "I mean..." Cathy laughs softly in my ear, her breath hot against my skin. "I’m good with whatever you decide," she responds, though there's undeniable interest in her tone. Amanda swallows hard, her grip tightening on my arm. Nails digging into my skin now. "Please I... I'd like to watch," she admits in a rush, almost inaudible. "If you'll let me." The words hang between us. Her eyes dart between me and Cathy, glinting with something new. A mix between arousal and anticipation.

"Well, then you have to make amends for your prior behavior," I say to Amanda before turning my head towards Cathy. "Tell me Cathy, what would be a good punishment for years off behaving as a spoilt brat?

Cathy arches against me, her body molding to mine as she considers her next words. She exchanges a look with Amanda that's equal parts mocking and hungry. "Hmm... I think she needs to prove she's really, really sorry."

"Yeah?" My eyes lock onto Cathy's gaze. "And how would she do that?" Cathy's grin turns wicked as she turns her attention fully to Amanda. "You know," Cathy starts. "Whenever I misbehaved as a child my dad used to threaten me with a spanking, never got one though." She grins . "Maybe that should be Amanda's punishment for being a spoilt brat." Amanda's breathing hitches at Cathy's words, her grip on my arm almost painful at this point. The color drains from her face for a split second before rushing back, painting her cheeks in an even more intense red. "You... you can't be serious," she breathes, though there's no real fight behind her words. Her free hand moves to her hair, lazily twirling a strand that had fallen down onto her face. Cathy's fingers trace circles on my chest, but her gaze never leave Amanda's face. "Why not?" She purrs. "If you really want to watch, really want to be part of this, then you have to prove it. To both of us."

I sit down again and give Cathy a quick peck on the lips, before I lift her off my lap. I then gently tap my knees. "Come on Amanda," I say. "Whats it gonna be?"

Amanda hesitates only a moment before crossing the short distance between us. Her movements are stiff with nerves, but she doesn't back down. She settles across my lap with hesitant grace, her body rigid with tension. The fabric of her sweatpants brushes against my jeans, sending a thrill through me. "Like this?" She asks, her words almost inaudible. Cathy moves to stand behind the couch, leaning over my shoulder. "No," she says sternly, her words dark with amusement. "Bare skin." Amanda's breathing catches at Cathy's words. She glances up at her friend, then back at me, her eyes flicking with excitement. Slowly, carefully, she reaches back to find the hem of her pants. She lifts slightly from my lap. The material slides down her thighs, revealing creamy skin and her toned backside, only covered by a thin G-string. Her fingers tremble slightly as she hooks her thumbs into the waistband of her underwear, pausing, before they follow her pants down to her ankles. "How many strikes do you think she deserves?" I ask, looking back at Cathy. Cathy crouches down behind the couch, her tits hugging the back of my head. Her fingers tracing lightly up Amanda's spine, pushing her back down on my lap. "Let's start with ten," Cathy suggests softly, “Lets see if that is enough to make her behave.” Her fingers move to Amanda's hair, gripping gently. "Unless she wants more." Amanda shivers under Cathy's touch, her breath coming in faster spurts now. She nods, her face betraying signs of both embarrassment and arousal. "Ten," she echoes in a breathy whisper. I slide my palm over the curve of her ass, savoring the first contact with her naked skin, her muscles tense beneath my touch. The skin is warm and soft, invitingly firm. My fingers spread slightly as I caress her, feeling the resistance of the firm flesh under my hand.

“I want you to thank me after each hit, understood? And count them out loud"

Amanda nods, her face pressing against the couch cushion as she grips the edge. She arches her back slightly, presenting her ass more prominently. Her fingers clutch at the cushion with white-knuckled intensity, anticipating the first hit. Up close, I can see the rapid rise and fall of her chest as she breathes, the faint flush spreading down her neck. "Y-yes," she whispers. "I understand." Cathy watches with intense focus, her hand still resting lightly on Amanda's back. Her other hand comes over my shoulder to brush a strand of hair from Amanda's face, tucking it behind her ear almost tenderly. The contrast between the sweet gesture and the impending discipline sends a thrill through me.

"Actually..." Cathy says. "I think she should say thank you, sir. So we know she knows who's in charge here," Amanda's entire body tenses at Cathy's words, a small whimper escaping her throat. The flush on her neck deepens. She looks back at me with eyes wide and full of mixed emotions, embarrassment and dread, and something darker I haven’t seen before, submission. "Yes... sir," she whispers hoarsely. I inhale slowly, relishing the power in this moment. My palm presses firmly against her right ass cheek, feeling the warmth off her body.

Without warning, I bring my hand back, and then down with a sharp smack. The sound cracks through the room like a gunshot. Amanda's body jerks forward, pressing into my thighs, a high-pitched gasp tearing from her throat. Her left hand flies back instinctively, as if to cover the reddening skin, but she freezes halfway. "Th-thank you... sir," she manages, her voice strained “That's one”. My fingers trail across the warm red mark I left, feeling the heat of it as her skin trembles beneath my touch. The second smack comes harder, centered on her left cheek, leaving an identical print. "Two... Thank you... sir," Amanda says more clearly this time, though her breathing has become increasingly ragged. Her hips press slightly forward into the me, as if seeking some kind of friction.

Cathy stands up again before she leans over me to whisper into her ear "Good Girl." Amanda's breathing becomes labored, her shoulders hunching as she grips the couch tighter. Sweat beads along her hairline, and her hips shift restlessly against my lap. The third strike lands squarely across both cheeks, the sound echoing louder in the quiet room. Amanda's entire body tenses, a sharp cry escaping her lips before she bites it back. Tears glisten in her eyes as she turns her head to look at me, her expression torn between pain and a deep, dark, intoxicating thrill. "Th-thank you, sir, that's number 3." My fingers dig into the reddened flesh of her ass, kneading the punished skin as she squirms beneath my touch. The smell off her arousal saturates the space between us, an unmistakable musk that mingles with the faint smell off coconut and vanilla from her hair.

"I think she's enjoying this too much," Cathy says with a smirk, leaning down again to whisper in Amanda's ear. "Look at you dripping onto the couch, like a needy little slut." Amanda's face burns crimson at Cathy's words, her hips pressing harder into me. I can see the wetness glistening between her thighs now, running down her legs and onto the couch and floor. I slip two fingers between her legs, tracing the outline of her pussy, savoring the heath. "Oh god," Amanda whimpers, her face buried in the couch cushion now. Her bare pussy glistens pink and swollen underneath her punished cheeks. The aroma of her arousal floods my senses as I press my palm against her wetness, smearing her juices across my hand. "Please," Amanda breathes, her words muffled against the couch. "I can't..."

My hand withdraws from between her legs and deliver her fourth smack.

The smack lands with an even sharp crack, echoing through the quiet living room. Amanda's back arches violently, her body jerking forward as a choked sob tears from her throat. Her fingers dig into the couch cushions, tearing at the fabric as her hips buck instinctively. "T-thank you, sir!" She gasps, the words coming out as a loud squeal. “Four”. Her entire body is trembling now. The red hand prints on her ass have deepened to a darker shade, the color vivid against her pale skin. I drag my nails lightly down the punished flesh, relishing the way she shivers at the delicate touch.

I deliver two more smacks in quick succession, both on her right cheek. The rapid speed of the strikes ignites her skin in sharp bursts of pain. Amanda's body convulses forward, a strangled cry escaping her lips. Her breathing comes in ragged gasps, her fingers clawing at the couch yet again as tears streak down her flushed face. Amanda turns her head to look at me, her eyes wide and glassy with a mix of pain and something far more alluring. Her lips part slightly, her tongue darting out to wet them. "Thank you, Sir, that's six" she breathes, fighting to get the words out in a coherent sentence. The heat between her thighs has intensified, her juices gushing out and creating a sticky trail on the leather of the sofa. You can see the way her inner muscles clench around nothing, her body demanding something to fill her. "Please, Sir," Amanda whispers, breaking on the last word. Cathy leans forward, her hand trailing down Amanda's back in a slow caress. "good girl, we're almost done with your punishment," she murmurs. Her fingers brush through Amanda's hair almost tenderly before she gives a sharp tug, forcing your stepsisters head upwards. "Isn't that right, Amanda?"

"Has she ever mistreated you Cathy?" I ask"Maybe you deserve to give her a smack as well?"

Cathy's face darkens with a cruel smile as she turns to Amanda. "Oh, I think everyone builds a long list of grievances dorming together, isn't that right Amanda?" She steps around the couch, her hips swaying with deliberate slowness as she positions herself behind Amanda. "I can still remember when you stole my black sweater freshman year. I found it with your dirty laundry three weeks later, yet you never admitted it." Cathy drags a fingernail down Amanda's back. "I think that deserves at least one, don't you?" Amanda whimpers, her fingers clutching the couch tighter. "Yes, Cathy," Amanda whispers, her body quivering with expectation.

I lean back slightly, giving Cathy room as she adjusts her stance. She smooths her shirt with one hand, while the other hovers above Amanda's ass. The silence in the room stretches thin as a wire. The crack of Cathy's palm against Amanda's flesh is sharper than mine. A crimson bloom appears where her hand lands, high on Amanda's right cheek.

"Now, say thank you Mistress." Amanda gasps at my words, her whole body shuddering from the impact. Her head turns toward Cathy, her face wet with tears and her mouth half-open in shock. She hesitates just a moment too long. Cathy's hand shoots out and grips Amanda's hair, yanking her head back sharply. "He said, say thank you Mistress." Her voice is lower now, more dangerous. Amanda's breath comes in short, ragged pants. "Th-thank you, Mistress, thats seven" she finally whispers, the words faint and unsteady. Cathy releases her hair pushing Amanda back down into the cushion. Another swing off her arm delivers strike number eight to Amandas backside. “Thank you, Mistress... eight”.

"Just two more, Amanda. And I will give you the choice. Should I deliver both, or do you want them both at the same time, one from each of us? “

Amanda's breath catches audibly at my words. Her body tenses, muscles coiling tight as she processes the offer. The tears on her face glistening in the evening light streaming through the curtains, her bottom lip quivering. I can see the rapid flutter of her pulse in her throat.

"Both... at the same time," she finally manages, her voice barely above a whisper. The words emerge in a rush, as if she's afraid I’ll change my mind if she hesitates. Cathy's lips curl into a predatory smile. She doesn't need to be told, her hand moves to rest beside mine on Amanda's burning ass, her fingers spreading possessively over the punished flesh. Cathy and I exchange a knowing look, then simultaneously draw our hands back and bring them forward with calculated ****. The twin smacks land almost simultaneously, mine to the right, Cathy's to the left. Amanda's entire body jerks violently forward, a strangled scream tearing from her throat as both the impacts register at once.

"Thank you! Thank you both!" she gasps between sobs, her fingers scrabbling at the couch cushions as if she might crawl away. Her ass jiggles from the **** of the strikes, the redness intensifying to a dark mark where our hands landed. Cathy crouches down beside the couch, her hand moving to Amanda's face to turn it toward her. "Now then," Cathy purrs, brushing a thumb over Amanda's tear-streaked cheek, "was that so hard?" Her other hand moves to caress Amanda's punished flesh, squeezing gently but firmly. Amanda whimpers at the contact, her hips pressing into me as if she's trying to escape the burning sensation. "N-no, Mistress," she breathes, her body struggling to deliver the words. Cathy's fingers trail down to Amanda's thighs, tracing the wetness running down towards her knees. "You took your punishment so well, are you ready for your reward" she murmurs.