Wife's Best Friend Begs for My Secret Thrusts

Mark had always known Lisa was trouble. Sarah's best friend since college, she was the wild one—the girl who turned every girls' night into a booze-fueled confessional. With Sarah away on her week-long work conference in Chicago, Lisa had begged to crash at their place for the weekend. "I hate being alone in my shitty apartment," she'd whined over the phone, her voice dripping with that playful lilt that made Mark's cock twitch despite himself. Sarah, ever the loyal wife, had insisted: "She's family, babe. Be nice to her."

Nice. Right. Lisa showed up Friday evening with a duffel bag and a bottle of tequila, her tight yoga pants hugging an ass that could make a priest sin. She hugged Mark too long at the door, her full tits pressing into his chest, nipples hard little points through her thin tank top. "Missed you, big guy," she purred, pulling back with a wink. Sarah waved goodbye from the airport shuttle that morning, oblivious.

That first night, they ordered pizza and cracked open the tequila. Lisa lounged on the couch in a cropped tee and shorts so tiny they rode up her thighs, flashing the edges of her lacy thong. She laughed at Mark's dumb jokes, touching his arm, her fingers lingering. "Sarah's so lucky," she said, biting her lip. "You two fuck like rabbits. I hear everything through those thin walls when I crash here."

Mark choked on his beer. "What?"

She grinned, leaning in, her breath hot with liquor. "Don't play dumb. Last time I stayed over, after that barbecue? I was in the guest room, finger-fucking my pussy to the sound of you railing her. Those secret thrusts of yours—god, the way you grunt and slam deep. I came so hard imagining it was me."

His cock stiffened instantly, betraying him. He shifted on the couch, but Lisa noticed, her eyes dropping to the bulge in his jeans. "See? You like me knowing your dirty little secret."

Saturday morning, Mark woke with morning wood, Sarah's side of the bed empty and cold. He jerked off in the shower, picturing Lisa's ass, hating himself for it. Downstairs, she was already up, wearing nothing but a skimpy silk robe that barely tied at her waist. The fabric gaped open as she bent over the coffee maker, revealing pert C-cup tits with rock-hard pink nipples and a shaved pussy peeking from between smooth thighs. No panties. No bra. Just pure fucking temptation.

"Morning, handsome," she said, turning with two mugs, her robe slipping off one shoulder. "Sleep well? Dream of pounding my tight little hole?"

"Lisa, what the fuck?" Mark growled, but his eyes devoured her. She sauntered over, hips swaying, and handed him the coffee, brushing her bare tits against his arm.

"I've had a crush on you forever, Mark. Sarah's my bestie, but you're the one I fantasize about. Those secret thrusts—I want them. In me. Betraying her with me." She untied the robe fully, letting it pool at her feet. Naked, flawless—toned legs, flat stomach, a juicy ass begging to be grabbed. Her pussy lips glistened already.

He backed up against the counter, cock throbbing painfully in his boxers. "This is crazy. Sarah—"

"Is gone." Lisa closed the distance, her hand sliding down his chest to palm his bulge. "And I'm here, dripping for you. Feel how wet?" She grabbed his hand, forcing it between her thighs. Her cunt was soaked, hot folds parting under his fingers. She moaned, grinding against him. "Fuck me like you fuck her. Those powerful thrusts I've heard. Make me your cheating slut."

Tension crackled like lightning. Mark's resolve crumbled as she dropped to her knees right there in the kitchen, yanking down his boxers. His thick eight-inch cock sprang free, veiny and leaking pre-cum. "Holy shit," she whispered, eyes wide with hunger. "Sarah wasn't kidding about this monster."

Before he could protest, Lisa swallowed him whole. Her mouth was a wet vacuum—lips stretching around his girth, tongue swirling the underside as she deepthroated him in one filthy plunge. Gagging wetly, she bobbed, slurping noisily, drool spilling down her chin onto her tits. "Mmmph, fuck my throat," she gasped, popping off to stroke him slickly. "Betray your wife with me, Mark. Feed me this cock, then wreck my tight pussy. I've wanted it so bad—your secret thrusts stretching me while Sarah's clueless."

That did it. The betrayal thrill hit like a drug. Mark tangled his fingers in her blonde hair, fucking her face brutally. "You dirty little homewrecker," he snarled, hips pistoning. "Begging for my married dick. Yeah, choke on it." She hummed approval, eyes watering, mascara running as she took every inch, her free hand rubbing her clit furiously.

He hauled her up, spinning her around to bend over the kitchen island. Her ass cheeks spread invitingly, pussy dripping down her thighs. "Please, Mark," she begged, arching back. "Fuck me. Pound me like you do her. Make me your side slut."

No more hesitation. Mark gripped her hips and slammed balls-deep into her cunt in one thrust. She screamed in ecstasy, walls clenching like a vice—tighter than Sarah's, velvet heat milking him. "Oh fuck yes! Those secret thrusts! Harder!"

He obliged, railing her with savage strokes, the slap of skin echoing. Her tits swung, ass jiggling with each brutal plunge. "You're so much bigger," she wailed. "Sarah doesn't deserve this cock. I do—fuck me raw!"

They didn't make it far. Mark scooped her up, carrying her writhing body to the stairs, cock still buried inside her. She bounced on him with every step, moaning obscenities. "Yes, take me to your marital bed. Defile it with me."

In their bedroom—the one with Sarah's lingerie drawer and framed wedding photo on the nightstand—Mark threw her onto the king-sized bed. The sheets still smelled like his wife's perfume. Lisa spread her legs wide, fingering her sopping pussy. "Claim me here. Make this your cheating den."

He pounced, pinning her in missionary. His cock speared her depths, stretching her pink folds obscenely. "Take it, you filthy whore," he growled, hooking her legs over his shoulders for maximum depth. Each thrust bottomed out, his balls smacking her ass, her clit grinding his shaft. Lisa's nails raked his back, tits bouncing wildly.

"Oh god, Mark! Yes—pound my cheating cunt! I'm your slutty sidepiece now. Fuck Sarah out of your mind—use my pussy instead!" She bucked up to meet him, inner walls fluttering, juices squirting around his pistoning dick.

The dominance surged. Mark flipped her onto all fours, yanking her hips back. Doggy style on his wife's pillow—perfect betrayal. He slapped her ass hard, leaving red handprints. "This ass is mine now," he grunted, slamming in from behind. Her cheeks rippled with each violent thrust, pussy creaming down his shaft. "Scream for it, Lisa. Tell me how much better I fuck you."

"Better than anyone! Slap it harder—fuck, yes! Your cock owns me!" She shoved back, grinding her ass on him, the bed creaking like it would break. He reached around to pinch her clit, making her howl.

But he wasn't done. "Ride me, slut." He lay back, cock glistening with her arousal. Lisa straddled him reverse cowgirl, impaling herself with a guttural moan. Her ass cheeks spread wide as she sank down, taking him to the hilt. "Watch this pussy swallow you," she taunted, bouncing furiously.

Mark gripped her hips, thrusting up to meet her slams. Her asshole winked above, puckered and tempting, but he focused on her cunt—dripping, clenching, the lewd squelch filling the room. She rode like a pornstar, hair flying, tits heaving out of sight but audible in her gasps. "Cum in me, Mark! Fill your wife's best friend's womb—knock me up with your betrayal seed!"

The words pushed him over. Her pussy spasmed, squirting hot girl-cum all over his abs as she came, screaming his name. "Fuuuuck! Squirting on your married cock!" Mark roared, hips bucking wildly, unloading rope after thick rope deep inside her. Her walls milked every drop, cum overflowing to drip down his balls.

They collapsed in a sweaty heap, panting. Lisa's body trembled with aftershocks, his cock softening inside her creampied hole. "That was... incredible," she whispered, kissing his chest. "Your secret thrusts are even better up close."

Reality crept in too soon. Sunday evening loomed; Sarah's flight landed tomorrow. "We can't," Mark muttered, but his hand stroked her thigh possessively.

Lisa slipped from the bed, grabbing her phone. "We already did. And we will again." She winked, dressing quickly in her skimpy outfit from before. "Gonna sneak out now—don't want Sarah suspecting. But this?" She snapped a quick nude selfie—cum-glazed pussy spread wide, her face smirking over her shoulder—and sent it to his phone with a ding. The text followed: "Your slutty sidepiece's pussy, waiting for more secret fucks. Betray her again soon?"

She blew a kiss and vanished out the back door like a ghost. Mark stared at the photo, cock twitching back to life. Sarah would be home in hours, none the wiser. But the thrill—the raw addiction to Lisa's tight hole, the betrayal rush—had him hooked. He was already plotting their next risky fuck: maybe the garage while Sarah napped, or her bending over in the laundry room mid-visit.

His phone buzzed again. Another text from Lisa: "When's our next cheat session, daddy?"

"You name the time," he typed back, heart pounding. "I'll thrust my way in."

But as he deleted the thread, her final message popped up, unread until now: "Tomorrow night—Sarah's girls' night out. Dare you to fuck me on her vanity while she sips wine downstairs?"