The next day. The afternoon haze lingered as we caught our breath on the couch, my cum still drying in sticky patches on their blue satin panties. My wife traced a finger along the damp gusset of her own pair, smirking at me before leaning over to kiss Sarah's cheek. 'That was fun, but these are borrowed. We need to get you your own stash, sis—something to match my collection. Those white nylons he loves? Let's shop for duplicates.'
Sarah's eyes lit up, her hand squeezing my thigh as she stood, the satin pulling tight across her ass one last time before she tugged her t-shirt down. 'Hell yes. Panty shopping with you? And knowing it'll drive him wild? Count me in.' She glanced at me, biting her lip. 'You stay here and recover, perv. We'll surprise you.'
They disappeared upstairs to change, emerging in jeans showing off their panty lines and sweaters, all innocent on the surface. I watched from the window as their car pulled away, my mind racing with images of racks of silky panties, gusset seams begging to be inspected. The house felt empty without their teasing presence, so I killed time with a shower, my cock stirring at the thought of what they'd bring back.
Hours later, the front door clicked open, followed by rustling bags and their excited chatter. 'He's gonna flip,' Sarah said, her voice carrying from the entryway. My wife laughed, kicking off her shoes. 'Oh, he will. But first, bedroom—time to model.' I emerged from the kitchen, heart thudding, as they breezed past me toward the master suite, arms loaded with tissue-wrapped packages from the lingerie boutique downtown.
They shut the door most of the way but left it cracked, an invitation I couldn't resist. Peeking through, I saw them on the bed, bags spilling open with an array of panties: white nylons, soft silky blends, even some satin with lace, but the stars were the full-back styles in crisp white nylon, identical to my wife's favorites—smooth fabric with that pronounced gusset seam running across the back, designed to hug the cheeks.
Sarah stripped first, shimmying out of her jeans and sweater, standing in just her bra and the borrowed blue satins. My wife sat cross-legged on the bed, watching intently as her sister hooked her thumbs into the waistband and peeled the blue pair down her legs. Sarah's bare ass came into view, firm and rounded, her pussy lips glistening slightly from the earlier fun. She stepped out, kicking the panties aside, then rummaged in the bags.
'These first,' Sarah said, holding up a pair of the white nylon panties —everyday style, opaque enough to tease but thin where it mattered. She sat on the edge of the bed, rolling them up her calves, then thighs, before standing to pull them over her hips. The nylon whispered as it settled, the full-back coverage molding to her curves instantly. She turned her back to the mirror—and to me—arching slightly to admire the fit. The gusset seam dipped perfectly between her ass cheeks, outlining the cleft like a shadow, the white fabric stretching taut over her mound in front.
My wife reached out, running her palm over Sarah's ass, fingers tracing the seam from top to bottom. 'Perfect match. Feel how it clings? That's what gets him— the way it frames everything.' Sarah nodded, twisting to check the front, the nylon cupping her pussy snugly, a faint outline of her slit visible if you looked close. She bent forward, hands on her knees, making the gusset pull even tighter, the cheeks parting just enough to hint at the warmth beneath.
'Next pair,' my wife urged, tossing her another set—this one in a pale pink nylon, same full-back cut but with a subtle sheen. Sarah didn't hesitate, sliding the white ones off and stepping into the pink. As she tugged them up, the fabric caught the light, hugging her hips and settling into place. She spun for her sister, the gusset line riding a little, accentuating the roundness of her butt. My wife's hands explored again, squeezing the cheeks through the nylon, thumbs pressing along the seam until Sarah gasped, her thighs clenching.
'You're getting wet already,' my wife noted, her voice low and teasing. She leaned in, nose brushing the fabric over Sarah's ass, inhaling deeply. 'Smells like arousal soaking in. Try this one on— the soft silky ones with the reinforced gusset.' Sarah complied, changing right there, the room filling with the soft sounds of nylon sliding off skin. The silky pair was thicker, more everyday, but the gusset was wider, sewn prominently to cradle. As Sarah modeled it, bending and stretching, the seam dug in just right, her ass flexing under the white material.
I gripped the doorframe, my cock rock-hard in my pants, pre-cum leaking as I watched them. They knew I was there—glances flicked my way—but they ignored me, lost in their game. Sarah tried on three more pairs: a sheer white nylon that turned almost transparent when stretched, a full-coverage brief in soft modal with a deep gusset, and finally a pair of high-cut nylon pantie that rode up her cheeks, the gusset vanishing between them like an arrow pointing to her hole.
Each change had my wife touching, adjusting, commenting on how the fabric felt against the skin, how the gussets would tease. Sarah's body responded, nipples hardening under her bra, pussy lips swelling and darkening the crotches of each pair before she switched. 'These are all for him,' Sarah said finally, standing in the last set, hands on her hips. 'But what if we make it even better? Dress him up too. Imagine his cock bulging in these— he'd love the feel, the humiliation mixed with the fetish.'
My wife's eyes sparkled as she nodded, spotting me fully now. 'Get in here,' she called, voice commanding but playful. I pushed the door open, stepping into the bedroom, face flushing but erection betraying my excitement. They pulled me to the bed, Sarah's hands already unbuckling my belt. 'Strip,' she ordered, and I did, pants pooling at my feet, cock springing free, veined and throbbing.
They selected a pair—the white nylon panties Sarah had just worn, still warm from her body. My wife knelt, holding them open, and I stepped in, the nylon cool against my ankles. She slid them up slowly, over my calves, knees, thighs, until they reached my hips. The full-back style was meant for curves, so on me, it stretched differently— the fabric tight across my ass, the gusset seam running across my crack, foreign but thrilling. In front, the pouch strained around my cock and balls, the nylon semi-sheer, outlining every ridge and the slit of my tip.
Sarah adjusted the waistband, her fingers brushing my shaft, making it twitch. 'Look at you,' she purred, stepping back to admire. The gusset pulled tight as I shifted, the seam pressing against my ass, a constant reminder. My wife palmed my bulge through the front, the nylon slicking with my pre-cum. 'Feels good, doesn't it? Your fetish from the inside out.'
I groaned, hands roaming my own body, feeling the smooth nylon hug my skin, the gusset teasing my most sensitive spots. They pushed me onto the bed, Sarah straddling my chest in her pink pair, grinding her panty-covered pussy against my stomach, while my wife knelt between my legs, her mouth hovering over the nylon bulge. She licked the fabric over my cockhead, the wet spot growing, her tongue tracing the outline through the thin material.
'Fuck, yes,' I muttered, hips bucking. Sarah leaned down, kissing me hard, her ass in the air so I could see the pink gusset stretched wide. My hands grabbed her cheeks, kneading the nylon, fingers dipping along the seam to feel her wetness seeping through. My wife sucked harder, the nylon barrier adding friction, her teeth grazing the fabric over my balls.
They switched, my wife mounting my face, her jeans off now—wait, no, she'd changed into one of the new pairs too, a sheer white nylon that let me see her pussy lips as she lowered onto my mouth. I licked through the gusset, tasting her juices mixed with the faint nylon flavor, my tongue pressing the seam into her slit. Sarah took over my cock, stroking it through the panties, then pulling the front aside just enough to suck the head bare while the nylon cupped my base.
The sensations overwhelmed—nylon on my ass, rubbing my hole as I thrust up; their gussets grinding and soaking; the room thick with moans. I came first, spurting into Sarah's mouth and across the white nylon front, the fabric turning translucent with my load. They didn't stop, riding my face and hand until they shuddered through their own climaxes, juices flooding the seams.
We collapsed in a tangle of limbs and panties, the bed littered with tried-on pairs. 'Welcome to the club,' my wife whispered, her hand still idly stroking my softening cock through the cum-soaked nylon. Sarah nodded, already eyeing the next bag. 'And we've got days left to play.'
