The air completely vanished from my lungs the exact moment the last word left Sophia’s mouth. My mind, which just seconds before had been trying to solve a complex programming glitch on my laptop, simply went blank. I felt a cold bead of sweat slowly trickle down the back of my neck.
Her gaze was locked onto me—steady, predatory, and carrying a mocking glint that completely unraveled me. Her hand was still gripping my shoulder, a heavy touch that felt like it was pinning me to that office chair. The house of cards that Mom and I had built so carefully over those months had just collapsed in the worst possible way.
"She knows. My God, Sophia knows everything," the thought hammered inside my brain at a frantic pace, making my heart feel like a jackhammer in my chest. A blind panic began to take over. If she told the rest of the family, if this got out, our lives would be utterly ruined. I would be viewed as a monster, and Mom would lose her job at the hospital and her dignity.
I tried to speak, but my throat was as dry as a desert. I swallowed hard, feeling my Adam's apple bob against my own hand as I tried to look away from her eyes, failing miserably.
"Sophia... I... it's not what you think..." I stammered, my voice coming out weak and pathetic.
"Don't try to lie to me, Lucas," she cut me off with a razor-sharp coldness, leaning in even closer. Her perfume, mixed with the scent of the wooden desk, felt suffocating. "I saw it. With my own eyes. Two weeks ago, when my car broke down. I saw you burying your dick inside her on your bed. And I heard very clearly what she begged you to do."
I closed my eyes for a second, utterly defeated. There was no way out. I was cornered by my own sister inside our spacious house. The despair reached its peak, and in my head, the only way to save Mom and myself was to give in to her blackmail. I needed to know the size of the damage.
"What do you want?" I asked, opening my eyes and facing her directly, my voice a bit firmer, though the trembling in my hands betrayed my panic. "How much is your silence going to cost? Money? I can give you my share of the allowance, I can do all your college assignments... just tell me what your silence costs, Sophia. Please."
Sophia let out a low laugh, a breathy sound that echoed through the quiet study. She released my shoulder and took a step to the side, resting her ass against the edge of the desk right beside me. She crossed her legs, causing the fabric of her jeans to stretch tight, tracing the shape of her thick, fleshy thighs.
"Money, Lucas? Do you really think I'm interested in your money or college homework?" she asked, shaking her head as that wicked smirk returned to her lips.
I froze in confusion, my panic easing slightly to make room for utter incomprehension.
"Then... what is it? If you don't want to ruin me and you don't want money, what do you want from me?"
Sophia leaned her body toward me again, but this time, her gaze slid slowly down my chest, stopping intently on my crotch. My dick, bizarrely, began to react to that absurd, forbidden tension.
She reached out and, with the tip of her index finger, gently stroked the top of my shaft, which was already starting to bulge against the fabric of my shorts. A sharp electric shock shot straight up my spine.
"I already told you, little brother," she whispered, her eyes gleaming with a twisted, hungry lust she no longer tried to hide. "Keeping a secret this big takes a lot of work. And the only payment that will make me keep my mouth shut... is for you to give me the exact same treatment you give Mom. I want to know what your dick tastes like, Lucas. And I want it right now."
The impact of those words hit me like a live wire. I stared at my sister, my eyes wide, trying to process what she had just proposed. Sophia didn't want to destroy us. She wanted in on the game.
"Are you... have you lost your mind?" I whispered, though my own body betrayed my words as my dick pulsed hard against the denim of my shorts.
"If I've lost my mind, it's your fault," she shot back, her voice cracking slightly, revealing for the first time the raw vulnerability she was trying to hide behind her blackmailer persona. She stepped closer, the heat radiating from her body enveloping me. "I broke up with my boyfriend months ago, Lucas. I was already starved, trying to just focus on my studies... and then I come home and find out my nerdy little brother turned into a stud. You two spend the whole day fucking in every corner! I hear Mom's groans through the walls of my bedroom, I smell the cum and sweat in the living room... Do you have any idea what it's like to spend two weeks masturbating in the bathroom while listening to your own mother get used like that?"
Her confession contained a carnal desperation so genuine that my panic completely dissipated, swallowed whole by an overwhelming wave of pure lust. Sophia was gorgeous: her rich brown hair, her full, pouty lips, and that twenty-two-year-old body perfectly distributed. The thought of possessing my sister, right after spending months dominating our mother, made my head spin.
"Sophia... if we start this, there is no turning back," I warned, my voice dropping an octave as I brought my hands down to her hips.
"I don't want to turn back," she replied, her eyes bloodshot with desire.
I shot up from the office chair all at once, pinning her against the edge of the wooden desk. I grabbed her face with both hands and kissed her. It was a violent, starved kiss, our tongues clashing with the urgency of someone who had been hoarding a forbidden desire for weeks. Sophia let out a muffled groan against my mouth, digging her nails into my back.
Without breaking the kiss, my hands slid down to the button of her jeans. I ripped the zipper open in a hurry, shoving the stiff denim down along with her black lace panties. When my hands brushed past her thick thighs and reached her intimacy, I realized she wasn't lying: Sophia was completely drenched, dripping with a hot, thick vaginal juice.
"My God, Lucas..." she wheezed as my fingers circled her swollen clit. "You're so hot..."
I hoisted her up onto the desk, sweeping the papers and my laptop to the side. Sophia laid flat on her back on the wood, spreading her legs wide open, exposing her flush, ultra-sensitive pussy. I freed my dick from my shorts; it was fully erect, throbbing with pure adrenaline. When she saw the size of my member up close, her eyes dilated.
"It's huge..." she whispered, swallowing hard, a mix of fear and sheer arousal. "Put it in... please, fuck me before I lose my mind."
I positioned the tip of my head at her entrance and shoved. I drove it in all at once, burying it to the root inside my sister's tight, gripping flesh. The clench was different from Mom's; Sophia was younger, narrower, and the heat inside felt like it was vacuuming my shaft to the very back.
"Ahhh! Lucas!" Sophia let out a sharp scream, throwing her head back on the desk, her hands gripping the wooden edges for dear life. "Fuck... it's all inside me... you're ripping me apart!"
I began to move in a hard, heavy rhythm. The sound of my pelvis slamming violently against her ass echoed through the quiet study. With every thrust, Sophia groaned loudly, biting her lips, completely surrendering to that pent-up need from months of drought and weeks of spying. She didn't want tenderness; she wanted to be used with the exact same force I used on our mother.
I grabbed her legs, throwing them over my shoulders to drive even deeper. The sight of my sister in that position, her face flushed and her eyes rolling back in pleasure, was the most profane and exciting thing I had ever experienced.
"Do you like this, Sophia?" I taunted, driving a thrust so deep it caused her inner walls to spasm violently around my dick. "Is this the price of your silence?"
"Yes... ohhh, yes! This is it... fuck me hard, little brother... fuck your sister!" she screamed, completely losing her filters, giving herself over to the delirium of incesto.
The pace became frantic. I could feel I was right at the edge, and the walls of Sophia's intimacy began to pulse violently, clamping down on my shaft like a vice. She let out a long, piercing cry, scratching the desk as her body shook in the peak of a violent orgasm. Seeing her break made me lose all control. I gripped her waist tight and unloaded a massive, scalding jet of cum deep inside her womb, filling her completely.
I stayed still for a few seconds, panting heavily, feeling the warmth of my semen overflow and drip onto the wood of the desk. Sophia’s eyes were closed, her breathing ragged, and a smile of pure satisfaction and relief was plastered across her face.
Slowly, I pulled my dick out of her with a wet pop. Sophia caught her breath sharply, looking down at her own stomach and watching the whitish trail leak out.
"You... you came all inside me... without a condom," she whispered, her voice trembling but devoid of any regret.
"You wanted the same treatment as Mom, didn't you?" I replied, wiping the sweat from my brow and smirking. "She always asks me to finish inside."
Sophia sat up on the desk, pulling her panties and jeans back up with trembling fingers, though that wicked smile had returned to her face.
"You're a monster, Lucas... and I loved every second," she said, hopping off the desk and adjusting her clothes. "Now our secret is safe. But you better save up your energy... because that was just the first installment of the payment."
She gave me a quick kiss, tasting of sweat and complicity, and strutted out of the study, leaving me alone with my laptop and the absolute certainty that the dynamic of this house would never be the same again.