The silence that followed the sharp clatter of the curtain being ripped open was heavy enough to suffocate. My heart hammered against my ribs, and I felt Sophia’s entire body stiffen beneath me. We were completely exposed. I was standing there with my fleece shorts around my ankles, still buried inside my sister, whose bare, sweat-glistening ass was on full display to the corridor, dripping with the cream of my fresh release.
But instead of the horrified scream of a sales assistant or a manager threatening to call the police, what we got was a sharp, collective intake of breath.
Standing in the opening was a stunning woman. She had an hourglass figure highlighted by a tight olive-green dress that accentuated her narrow waist and wide hips. Her long brown hair fell in perfect waves over her shoulders, and her piercing hazel eyes locked directly onto our scandalous arrangement. She held a shopping bag in her left hand, but upon encountering the explicit sight—me pressed tightly behind Sophia, who was still flaunting her completely bare ass—the woman simply froze.
The ensuing silence was suffocating. Sophia held her breath, her face flushing a deep, burning crimson. My cock, reacting to the sheer, terrifying adrenaline of the moment, gave a sudden, hard throb inside her, instantly springing back to life.
The stranger noticed. A slow, incredibly decadent smile began to spread across her perfectly painted lips. She didn't call for help. Instead, she stepped right inside the cramped box, reached back, and smoothly pulled the curtain shut behind her, sealing the three of us in the dim, musky heat of the cubicle.
"Well, well..." she murmured, her voice a low, velvety purr that made the hairs on my neck stand up. "I just wanted to see if this stall was free, but it seems you and your boyfriend were already taking very good care of it. You two are incredibly bold. I could hear the moans from two stalls down."
I tightened my grip on Sophia’s waist, refusing to back down, sustaining the older woman's predatory gaze. "Are you going to report us, or are you just going to stare?" I asked, my voice thick and raspy.
Sophia, emboldened by the stranger’s lack of hostility and driven by her own deep exhibitionist streak, peeked over her shoulder through the mirror, dropping the truth with an audacious smile:
"He's not my boyfriend. He's my brother."
The confession hung in the air like an electric charge. The woman’s hazel eyes widened slightly, but far from showing disgust, her pupils dilated completely. She bit her lower lip, a look of pure, unadulterated lust washing over her face. The taboo was the ultimate catalyst.
"Brothers?" she whispered, her breathing turning shallow and heavy. "God... that is so beautifully twisted. Nice to meet you, my name is Letícia. I'm 25, but I must confess I've never seen anything quite like this before. No wonder she was squeezing you so tight."
Without another word, Letícia reached for the side zipper of her olive dress. As the zipper ran down, the fabric parted, and she let the dress slide down her hips, pooling at her feet. She was wearing nothing but a tiny black lace thong. Her body was magnificent—fair, smooth skin, full, natural breasts with dark nipples hardening in the cool air of the store.
She stepped closer, the rich, expensive scent of her perfume blending with the raw smell of our sex. Letícia sank to her knees right there in the narrow space between my legs and the mirror. Her long, manicured fingers wrapped around the base of my shaft, sliding me smoothly out of Sophia’s wet warmth. My sister let out a needy, hollow sigh at the sudden emptiness.
Letícia didn't hesitate. She leaned in, her warm lips wrapping around the head of my re-hardened cock, taking me into her mouth with an expert, suffocating swirl of her tongue. I groaned aloud, my hands flying to her silky hair as she began to suck me with a fierce, experienced rhythm, her eyes looking up to meet mine, full of wicked delight.
"Ah... Lucas..." Sophia whimpered from the bench, watching the reflection in the mirror. The sight of that woman on her knees, devoruing her brother's cock right in front of her, pushed Sophia over the edge. She began to rub her own dripping clit desperately, her hips twitching against the wood.
Letícia pulled back with a wet pop, a strand of saliva connecting her lips to my aching tip. She stood up, her breasts brushing against my chest, and turned her back to me, gripping the metal frame of the mirror. She arched her back, pressing her mature, smooth curves right against my thighs.
"Put it inside me, little brother," she whispered over her shoulder, her voice dripping with filth. "Let me feel what your sister was crying about."
I grabbed her wide, soft hips, positioning my throbbing length against her slick, dripping heat. With one heavy, brutal thrust, I buried myself to the hilt inside her tight, mature warmth.
"Oh, fuck!" Letícia cried out, a loud, unbridled gasp that she barely managed to muffle against her hand. Her inner walls clamped down on me like a vice, so much tighter and more demanding than Sophia's.
I began to drive into her hard, the rhythm fast and frantic under the constant threat of the public corridor just inches away. The sound of our flesh slapping together was deafening in the tiny stall.
Right then, Sophia turned around, kneeling on the bench, and wrapped her arms around Letícia's neck, pulling her by the chin and capturing her mouth in a fierce, tongue-tied kiss.
Upon feeling my sister's soft lips, Letícia's hazel eyes widened in a clear expression of surprise at being kissed by another woman. However, the shock lasted for only a fraction of a second; in that very same instant, consumed by the overpowering lust of that forbidden fuck, Letícia closed her eyes and returned the kiss intensely. Her tongue found Sophia's with a hungry, urgent curiosity, surrendering herself completely to my sister while I continued to pound her from behind.
The exhibitionism and lust had reached their absolute peak. Surrounded by mirrors, I watched myself sinking into Letícia while she and Sophia devoured each other in a wild kiss. Letícia thrashed against me with even more force, her mature, 25-year-old body taking every heavy blow until she began to shudder violently, her inner walls throwing crushing spasms that milked me entirely.
The desperate grip of her climax pushed me over my own edge. I held Letícia’s waist with total force, driving my cock as deep as I possibly could into her, and let everything go. I came abundantly, spilling hot, deep spurts right into the depths of Letícia's womb, filling her to the brim while she shook in my arms. Sophia watched everything up close, moving her hand frantically between her own legs until she let out a muffled cry, collapsing on the bench in a synchronized, sweat-drenched orgasm.
The three of us stayed tangled together for a long minute, chests heaving, completely drenched in sweat and fluid, listening to the distant, oblivious chatter of shoppers outside.