The Sister's Tender Assignment

Chapter 1

The silence in the house was always heaviest on the second night. Marcus stood in the master bedroom, the empty space on his wife’s side of the bed a stark reminder. Her business trip was a long one—fourteen days. She’d kissed him goodbye with a mysterious smile, whispering, “I’ve arranged for company. Don’t be shy.”

He hadn’t understood. Not until the doorbell rang an hour ago.

Chloe stood in the doorway, the porch light casting a warm glow on her brown hair, which fell in loose waves over her shoulders. She was nearly as tall as he was, her frame lean and graceful. In her hands, she held a small overnight bag and her phone, the screen still lit.

“Hi, Marcus,” she said, her voice a playful murmur that cut through the quiet. Her blue eyes, so like her sister’s yet uniquely mischievous, held his. “Vanessa sent me. She said… you might need looking after.”

He stepped aside, letting her in, the familiar scent of her perfume—different from his wife’s—filling the foyer. “She called it ‘looking after’?”

Chloe’s smile widened as she dropped her bag by the stairs. “Her exact words were a bit more direct.” She walked past him, her movements confident, and headed toward the kitchen. “She said I’m to make sure you don’t get too lonely. To… take care of your needs while she’s gone.”

Marcus followed, his heart beginning a slow, heavy thump against his ribs. The taboo of it was a live wire in the air, crackling between them. This was his wife’s younger sister. The one they’d had over for holidays, the one he’d joked with for years. Now, she was here, in his home, with a mandate from his wife to fuck him.

“She really said that?” he asked, his voice lower than intended.

Chloe turned, leaning against the kitchen island. She nodded, pulling her phone from her pocket. With a few taps, she turned the screen toward him. It was a text thread with his wife.

**Vanessa:** *He gets tense when I’m gone for long. Don’t let him brood. Get him good and relaxed, Hal. However you need to.*
**Chloe:** *You’re sure?*
**Vanessa:** *I’m sure. I trust you. Make him feel loved. Use your mouth. Let him take you from behind. Just love him for me.*

Marcus read the words, a surge of heat flooding his gut. The permission was explicit, shocking, and unbearably arousing.

Chloe put the phone down, her gaze never leaving his. “She’s very clear about what she wants for you.” She pushed off the island and closed the distance between them in two slow strides. “So. Are you tense, Marcus?”

Her hand came up, fingers brushing over the tight cord of muscle in his shoulder. He was taller, more broadly built, but she met his eyes without a hint of submission, only a shared, adventurous complicity. This was a game, a secret mission, and they were both willing players.

“Starting to be,” he admitted, his own hand coming to rest on her hip.

“Good,” she whispered, her lips curving. Her other hand slid down his chest, over the hard plane of his stomach, her intent unmistakable. “Let’s not keep my sister waiting.”

---

Chapter 2

The text message, her touch, the electric permission—it shattered the last of Marcus’s restraint. With a low groan, he captured Chloe’s mouth in a fierce kiss, his hands sliding down to grip her ass, pulling her tight against him. She laughed into his mouth, a sound of pure victory, and broke the kiss.

“Bedroom,” she breathed, nipping at his lower lip. “Now.”

He didn’t need telling twice. In a swift motion, he lifted her, her legs wrapping around his waist as he carried her down the hall to the master suite. He tumbled them onto the mattress, but she was already moving, rolling with a playful agility that put her on top. Before he could sit up, her hands were on his shoulders, pushing him firmly back into the pillows.

“Uh-uh,” she chided, her blue eyes dark with intent. “My show.”

She settled her weight over his hips, the thin fabric of her jeans a maddening barrier against the hard length of him straining against his own. She began to rock, a slow, deliberate grind that made him curse and buck beneath her.

“Vanessa told me how you like it,” Chloe whispered, leaning forward so her hair created a private curtain around their faces. Her voice was a husky, intimate thing. “She said you get so quiet, so focused, when you’re about to lose it. She said you love it when she rides you slow and deep, taking all of you.”

Her words were fire in his veins. “Chloe…”

“Shhh. I’m going to ride you just like she does,” she promised, her grinding becoming more insistent, a filthy promise of friction. “I’m going to feel you fill me up in that same way. But first…”

Her hand slid down his stomach, popping the button of his jeans. The zipper hissed open. In one smooth motion, she tugged his boxers down and freed his cock, already slick at the tip. Her eyes locked on his as she shifted lower, her breath hot against him.

“First, I want a taste of what my sister gets to enjoy whenever she wants.”

Her mouth descended, and the world dissolved into wet, searing heat. She took him deep, her tongue swirling around the head before sliding down his shaft. A guttural moan tore from Marcus’s throat. His hands fisted in the duvet as she worked him with skilled, hungry pulls, her lips stretched tight around him. The obscene, wet sounds filled the room, punctuated by her soft sighs of pleasure.

“Fuck, Chloe,” he gasped, his hips lifting off the bed.

She pulled back with a soft pop, looking up at him, her lips glistening. “Good?” she murmured, her hand stroking him slowly.

“Don’t stop.”

---

Chapter 3

“Don’t stop,” Marcus growled, the words torn from him.

Chloe smiled, a wicked curve of her lips. “So demanding,” she whispered, her breath hot against his wet skin. “But my sister said to be good to you.” Her hand continued its slow, maddening stroke. “Tell me what you want, Marcus. Use your words.”

He swallowed, his gaze locked on hers. “I want your mouth. Again.”

“Better.” She lowered her head, but this time she didn’t take him deep. She traced the swollen head with the very tip of her tongue, lapping at the slick bead of precum. A sharp, desperate sound escaped him. “You taste so good,” she murmured, the vibration humming against his cock. “No wonder she loves doing this for you.”

Her words were a dark, thrilling fuel. “She talk about it often?” he managed to ask, his voice rough.

Chloe pulled off with a soft, wet sound. “All the time. How much you need it when she’s gone. How she worries you’ll be all wound up.” She crawled up his body, her jeans scraping against his thighs, until she was straddling his chest. She looked down at him, her blue eyes blazing with playful dominance. “She described exactly how you like to be fucked. Now, are you going to let me take care of you, or are you going to keep asking questions?”

She leaned down, bringing her mouth to his ear. “She told me you love it doggy style. That you get so deep that way.” Her teeth grazed his earlobe. “You want to get deep inside me, Marcus? While I think about my sister watching?”

A shudder racked his frame. He gripped her hips, his fingers digging into the denim. “Yes.”

“Then get these off me,” she commanded, rolling to the side.

Marcus moved in a frenzy of need. He pushed her onto her back, yanking her jeans and panties down her long legs in one frantic motion. She helped, kicking them off the edge of the bed. Now she was naked beneath him, her body sleek and eager. He settled between her thighs, the head of his cock pressing against her wet heat. He paused, drinking in the sight of her—flushed, breathing hard, her sister’s wicked gift.

“Tell me,” he said, echoing her earlier command.

Her eyes glinted. “Fuck me. Take me from behind. And don’t be gentle.”

---

Chapter 4

Chloe laughed, a low, breathy sound, and gave his cock a final, firm stroke before rolling off him. He groaned at the loss of contact.

“Your turn,” she whispered, her eyes gleaming in the dim room.

Before he could move, she placed her palms flat on his chest and pushed. It wasn’t a gentle suggestion; it was a firm, playful command that sent him sprawling backward onto the mattress. He landed with a soft thump, looking up at her as she loomed over him, a goddess of mischief and permission.

She swung a leg over his hips, straddling him, her naked skin hot against his stomach. Leaning down, her hair tickling his face, she brought her lips to his ear. Her voice was a husky, intimate thread.

“You know, Vanessa always says this is your favorite,” she whispered, her breath making him shiver. “Missionary. Face-to-face. So you can watch her fall apart.” She nipped his earlobe. “But I want to try it my way. I want to watch *you* fall apart while I take all of this,” she said, her hand sliding down to wrap around his rigid length, guiding him to her entrance. “Slowly. So we both feel every second.”

His hands came up to grip her thighs, his knuckles white. “Chloe…”

“Shhh,” she murmured, her gaze locked on his. “Just feel.”

With agonizing, deliberate slowness, she began to lower herself. The head of his cock pressed against her slick, hot opening, and they both gasped. She paused, letting them both feel the exquisite pressure, the promise of violation and gift all at once.

“This is how she does it?” he ground out, his hips straining upward, seeking more.

“Almost,” Chloe breathed, sinking another fraction of an inch, taking him in with a tight, wet heat that made his vision swim. “But she’s my sister, not me.” She dropped another inch, a soft moan escaping her as she stretched to accommodate him. “I’m going to fuck you with everything I’ve got. I’m going to take you deeper, and I’m going to make you say my name.”

She sank down fully, seating him to the hilt inside her with a final, breathless sigh. She was impossibly tight, impossibly hot. She held herself there, trembling, her inner muscles fluttering around him as she adjusted, her blue eyes wide and dark with a passion that was entirely her own.

“See?” she panted, beginning a slow, rolling grind. “Her idea… my intensity.”

---

Chapter 5

Chloe’s words, her command, were the final spark. He rolled her onto her stomach with a swift, powerful motion, the sheets whispering beneath her. She gasped, then laughed into the pillow, pushing herself up onto her hands and knees. Her back arched, presenting herself to him, her wetness glistening in the low light.

“About time,” she breathed, looking over her shoulder. Her blue eyes were smoky with need. “She said you like to grip my hips right here.” She guided his hands to the curves of her ass, pressing his fingers into her flesh. “Said you like to watch yourself disappear inside me.”

He positioned himself behind her, the head of his cock nudging against her slick entrance. “She told you everything.”

“Every. Little. Thing,” Chloe panted, pushing back against him, inviting him in. “Now fuck me like you mean it. Fuck me like you wish you could when she’s just in the next room.”

With a rough groan, he drove into her, one deep, claiming stroke that buried him to the hilt. Chloe cried out, a sharp, ecstatic sound that dissolved into a guttural moan. She was impossibly tight, hot, and wet, her inner muscles clenching around him in a velvety vise.

“Oh, God, yes,” she gasped, dropping her forehead to the mattress. “Just like that. Don’t you stop.”

He set a punishing rhythm, each thrust a deliberate, deep plunge. The sound of skin meeting skin filled the room, a brutal, rhythmic counterpoint to their ragged breathing. Chloe met every drive, rocking back against him, her fingers twisting in the sheets.

“You feel so good,” she moaned, the words muffled. “So fucking deep. Tell me, Marcus. Tell me how my sister’s pussy feels.”

Her dirty talk was a live wire. “Tight,” he grunted, his grip on her hips tightening. “Hot. Perfect.”

“Is it better when she’s gone?” she taunted, pushing up onto her elbows to look back at him, her hair sticking to her flushed cheek. “When you get to fuck her little sister in her bed?”

He answered with a sharper, deeper thrust that made her cry out. “It’s different.”

“How?” she demanded, her voice breaking on a moan.

“You’re louder,” he growled, increasing his pace. The bed began to creak in protest. “You talk more. You take it… harder.”

A wild laugh escaped her. “Good. I want you to remember this. I want you to remember *me* every time she goes away.” She reached a hand back, sliding it between her own legs. “I’m so close, Marcus. Make me come. Then fill me up. Do it for her.”

---

Chapter 6

Her words were a trigger. He obeyed, pounding into her with a raw, driving rhythm that made the headboard tap a frantic beat against the wall. Chloe’s cries were sharp, unfiltered, her body arching and writhing beneath his hands.

“Yes! Right there, Marcus, God!” she screamed, her voice raw. Her inner muscles clenched around him in frantic, fluttering waves, her orgasm ripping through her with a violence that made her legs shake. He felt it, the intense, pulsing grip, and it took every ounce of his control not to follow her over the edge.

As her tremors subsided into shuddering breaths, he slowed, still buried deep inside her. He stayed there, panting against her sweat-slicked back, his own need a throbbing, urgent drumbeat.

Chloe turned her head, a lazy, triumphant smile on her face. “Good boy,” she breathed, her voice husky. “You held on for me.” She pushed back against him, a slow, deliberate grind. “Now, while I’m all soft and sensitive… tell me.”

“Tell you what?” he grunted, his hips giving a shallow, involuntary thrust.

She laughed softly. “Don’t play dumb. My sister. What doesn’t she let you do?” She reached a hand back, her fingers trailing over his thigh. “What are the kinky little fantasies you have to keep locked up when she’s here?”

The question, asked in this intimate, vulnerable position, sent a fresh jolt of electricity through him. The taboo of confessing this to his wife’s sister, in his wife’s bed, was almost as potent as the sex itself.

“Talk to me,” Chloe whispered, squeezing him internally with a gentle, coaxing pressure. “I’m not her. I won’t judge. I want to know.”

He took a deep breath, his forehead resting between her shoulder blades. “There’s a position,” he began, his voice rough. “Where I’m sitting up, and you… you ride me, but facing away. So I can see everything. Watch myself. Watch you take it.”

Chloe moaned, a sound of pure appreciation. “Mmm, I love that. Controlling the pace, giving you the show. Vanessa doesn’t like it?”

“She says it feels… too detached,” Marcus admitted, his hands sliding up to her waist. “She likes to see my face.”

“I like to see your cock,” Chloe countered, her tone playful and wicked. “What else?”

Emboldened, the words spilled out. “I’ve wanted to… to finish on you. Not inside. On your stomach, or your back. Just… mark you. See it on your skin.”

A shiver ran through her. “Yes,” she hissed. “Claim it. She thinks it’s messy, doesn’t she?”

He nodded against her back. “Says it’s a waste.”

Chloe laughed, the sound low and thrilling. “It’s not a waste. It’s a prize. Anything else? Tell me the dirtiest one.”

The darkest fantasy rose to the surface, fed by the heat and the permission in her voice. “Sometimes… I imagine her watching. Watching you and me. Telling you what to do to me. Or me to you.”

Chloe went very still for a moment, then let out a slow, heated exhale. “Fuck, Marcus,” she murmured, pushing herself up. She guided him to roll onto his back, then straddled him, sinking down onto his length with a luxurious sigh, facing his feet. The new angle was deep, possessive. She began to move, a slow, rolling grind. “That’s so fucking hot. You want an audience? You want her to see how good her little sister can make you feel?”

“Yes,” he groaned, his hands finding her hips, his thumbs digging into the firm swell of her ass.

“Then imagine it,” she commanded, her pace increasing. “Imagine she’s right there, in the corner. Watching me take you deeper than she ever does. Listening to me beg for it.” She leaned forward, bracing her hands on his shins, presenting herself completely to his gaze and to the phantom observer in the room. “Now fuck me like you’re putting on a show for her. Fuck me like you want her to see how badly you need this.”

---

Chapter 7

Her command was a fire in his blood. Marcus obeyed, his hands gripping her hips hard as he drove up into her from below, his thrusts powerful and deep. The new angle allowed him to see everything—the flex of her back, the perfect curve of her ass, the slick, glistening evidence of their joining with every downward plunge she took.

“That’s it,” Chloe moaned, her head falling back. “Fuck, yes. Give it to me. Show her.” She rode him with increasing ferocity, her inner walls gripping him in tight, rhythmic pulses. “Tell me what she sees. Describe it to me.”

Marcus’s vision swam, the phantom image of his wife in the shadowed corner searing his mind. “She sees you,” he grunted, the words torn from him. “She sees how you take it. How you fucking beg for it.”

“Do I?” Chloe panted, slowing to a torturous, grinding roll. “Am I begging?”

“Yes,” he hissed, his fingers digging into her flesh. “You’re her greedy little sister, stealing her husband’s cock. And she’s letting you. She’s loving every second of it.”

A sharp cry tore from Chloe’s throat, half pleasure, half triumph. “Then make her watch me come,” she demanded, her pace becoming frantic, slamming down onto him. “Make her see you make me come all over your dick!”

The crude, graphic command shattered his last restraint. He pistoned up into her, meeting her every desperate fall, the sound of their collision wet and obscenely loud in the quiet room. Chloe’s body locked, a silent scream on her lips as her orgasm ripped through her, convulsing around him in a series of violent, milking spasms. The intense, clenching pull was too much.

“Chloe,” he warned, his voice a ragged growl.

“Don’t you dare come inside me,” she gasped, still trembling from her peak. She scrambled off him, his cock springing free, glistening and painfully hard. In one fluid motion, she turned and dropped to her knees between his legs, her hand wrapping around his base. “You wanted to mark me. So do it. On my face. Let her see that, too.”

Her blue eyes, blown dark with desire, held his as she guided him with firm, urgent strokes. The sight of her—his wife’s sister, on her knees, waiting for his release—unleashed the final, cataclysmic wave. With a guttural shout, his orgasm erupted, hot stripes painting her cheek, her chin, catching in her eyelashes.

Chloe didn’t flinch. She held his gaze, a slow, filthy smile spreading across her slickened lips. She released him, running a finger through the mess on her skin and bringing it to her mouth. “Mmm,” she hummed, her tongue tasting him. “See? Not a waste at all.”

She crawled up his body, collapsing beside him, her breath hot against his neck. They lay in silence for a long moment, the only sound their slowing heartbeats.

“She’s going to call tomorrow,” Chloe whispered, her voice drowsy with satisfaction. “You know what you have to tell her?”

“What?” Marcus murmured, his arm curling around her.

“That her gift was perfect. And that her sister takes very good care of you.” Chloe pressed a soft, claiming kiss to his shoulder. “Now go to sleep. I’m not done with you yet.”

---

Chapter 8

Chloe’s tongue swept slowly across her bottom lip, her eyes locked on Marcus’s as she savored the taste. The silence was thick, charged with the raw scent of their sex and the echo of her command.

The sharp, tinny ringtone shattered the quiet.

Chloe didn’t startle. A slow, predatory smile spread across her slick face as she glanced at her phone vibrating on the nightstand. “Right on time,” she murmured. She reached over, her bare breast brushing Marcus’s arm, and tapped the screen, putting the call on speaker before he could even process the move.

“Chloe? You there?” Vanessa’s voice, bright and clear, filled the room.

“Hey, sis,” Chloe answered, her tone casually intimate. She settled back against Marcus’s side, her hand coming to rest possessively on his bare stomach. “I’m here. So is he.”

“Perfect. I just landed. Is he… taken care of?”

Marcus froze, his body still humming from release, acutely aware of Chloe’s sticky skin against his, the evidence of his orgasm drying on her cheek. Chloe’s fingers traced idle circles on his abdomen.

“Oh, he’s been taken care of,” Chloe said, her voice dropping to a low, conspiratorial purr meant for both of them. “Very thoroughly. We just finished, actually.”

A brief pause on the line. “And? How was my gift?”

Chloe turned her head, her blue eyes boring into Marcus’s. Her smile was a challenge. She pushed the phone closer to his face. “She’s asking you, Marcus. Tell her.”

His throat was dry. The intimacy of the moment was grotesque and electrifying—his wife’s voice in his ear while her sister’s naked body was draped over his. “It was… incredible, Vanessa,” he managed, the words feeling both like a betrayal and the hottest truth he’d ever spoken.

“Just incredible?” Vanessa teased, her smile audible through the phone. “Chloe, did you not perform to standard?”

Chloe laughed, a rich, throaty sound. She leaned in, her lips grazing Marcus’s ear as she spoke to the phone. “He came so hard he could barely speak. Isn’t that right, baby? You painted your little thank-you note all over my face.”

Marcus’s breath caught. The explicit confession, delivered to his wife with Chloe’s mouth against his skin, sent a fresh, shocking jolt of heat to his groin.

“Chloe!” Vanessa gasped, but there was no real scolding in her tone, only a breathless kind of approval. “You’re terrible. Marcus, is that true?”

Chloe’s hand drifted lower, her fingers lightly brushing his softening cock, a silent promise of more. Under her touch, he began to stir again.

“It’s true,” Marcus admitted, his voice growing steadier, darker. He was playing the game now, fully complicit. “She followed your instructions to the letter. It was perfect.”

“Good,” Vanessa sighed, the sound satisfied and warm. “I’m glad you two are… connecting. Don’t let him get lonely, Hal. I’ll call tomorrow.”

“We won’t,” Chloe promised, her gaze never leaving Marcus’s. “Love you, sis.”

“Love you both. Bye.”

The call ended. The dial tone buzzed for a second before Chloe tossed the phone aside. The room plunged back into a silence that was now infinitely more charged.

“See?” Chloe whispered, shifting her weight to straddle him again, her core hovering just above his renewed erection. Her thumbs brushed the drying streaks on her cheeks. “She loves it. She loves us.”

She lowered herself, not taking him inside, but grinding her wetness against his length, using him to stoke her own arousal back to life. “Now,” she said, her voice dripping with dark intent, “since you’re not lonely anymore… let’s see how many times your wife’s gift can make you come before the sun comes up.”

---

Chapter 9

The insistent buzz of a video call echoed through the quiet bedroom. Chloe, still draped across Marcus’s chest, let out a soft, knowing laugh. She reached for her phone on the nightstand, her movements languid and satisfied.

“Told you she’d want to see,” Chloe murmured, swiping to accept. She shifted, propping the phone up against a pillow so the camera framed them both: Marcus on his back, Chloe curled against his side, the sheet pooled at their waists.

Vanessa’s face filled the screen, her expression bright and eager. The camera angle shifted, pulling back to show she was propped against a hotel headboard, the room’s generic art visible behind her. And she was gloriously, unabashedly naked.

“Hi, you two,” Vanessa said, her voice a warm purr. Her free hand was already between her legs, her fingers making slow, circling motions over her pussy. “Don’t mind me. Just checking in on my favorite people.”

Marcus’s breath hitched. Seeing his wife like this, touching herself while looking at him and her sister in their bed, was a dizzying rush. His cock, half-hard against his thigh, twitched and began to fill again.

“We don’t mind at all,” Chloe said, her own hand sliding down Marcus’s stomach to wrap around his growing length. She gave him a slow, deliberate stroke. “See? He’s still ready for more. Your gift is very… receptive.”

Vanessa’s eyes darkened with pleasure. She bit her lip, her fingers dipping lower, slipping inside herself. “Good. That’s so good, baby. Now, Chloe, I want you to get on top of him. Ride him. But I want to see his face.”

Chloe obeyed instantly, moving with a fluid grace that spoke of confident ownership. She swung a long leg over Marcus’s hips, settling her weight onto his thighs. She kept her hand on his cock, guiding him to her entrance but not taking him inside yet. Her blue eyes locked onto the screen.

“Like this, Vanessa?”

“Perfect,” Vanessa moaned, her own movements becoming more urgent. “Now lower yourself. Slowly. I want to watch him disappear inside you.”

Chloe obeyed, her gaze burning into Marcus’s as she began to sink down. The sensation was a tight, wet, consuming heat. Marcus groaned, his hands flying to her hips, his fingers digging into her skin.

“Tell me what it feels like, Marcus,” Vanessa commanded from the phone, her voice ragged. Her fingers worked faster. “Tell your wife while her sister takes your cock.”

“It’s… God, it’s so deep,” Marcus grunted, his hips arching up to meet Chloe’s slow descent. “She’s so tight. So hot.”

“Fuck him faster, Hal,” Vanessa panted, her back arching off the hotel bed. “Make him lose his mind. I want to see his eyes roll back.”

Chloe began to move, establishing a ruthless, driving rhythm. Her breasts swayed, her head falling back. “You hear that, Marcus?” she gasped, riding him hard. “Your wife wants a show. Come on, fuck up into me. Give it to me.”

The obscene, wet sounds of their joining mixed with Vanessa’s sharp cries through the speaker. Marcus was caught between two realities: the physical intensity of Chloe’s body claiming his, and the visual of his wife bringing herself to the brink while directing the action.

“That’s it,” Vanessa choked out, her thighs trembling on screen. “Just like that. I’m so close. Chloe, tell him… tell him who you belong to.”

Chloe leaned forward, her sweat-slicked skin sliding against Marcus’s chest. Her mouth found his ear. “I’m yours right now,” she growled, her voice low and fierce for only him, even as her sister listened. “But I’m hers always. And she’s letting you have me. Now come for your wife. Come for her while she watches.”

The command, the sight, the overwhelming taboo of it all shattered Marcus’s control. A ragged shout was torn from his throat as his orgasm ripped through him, his hips slamming up to meet Chloe’s as he emptied himself inside her with deep, pulsing waves.

On the screen, Vanessa’s cries peaked into a sharp, keening wail, her body bowing as her own climax took her. For a long moment, the only sounds were their ragged breaths and the staticky hum of the open connection.

Chloe collapsed onto Marcus’s chest, both of them spent and trembling. She turned her head toward the phone, a triumphant, spent smile on her lips. “Satisfied, boss?”

Vanessa, breathing heavily, offered a sated, blissful smile. “Completely. My two favorite people. I’ll call tomorrow.” The screen went dark.

In the sudden quiet, Chloe nuzzled into the crook of Marcus’s neck. “See?” she whispered, her voice thick with possession and pride. “She loves us.”