“You’re really going to just sit there and watch?” my sister gasped, her voice trembling as she arched her back, her hands gripping the edge of the bed. Her eyes locked onto mine, a mix of defiance and desperation in them.

I didn’t answer. I couldn’t. My throat was dry, my heart pounding so hard I thought it might burst through my chest. I just nodded, my fingers digging into the armrest of the chair I was sitting in, my legs crossed tightly as if to hold myself together.

My husband, Mark, stood behind her, his hands gripping her hips, his body pressed against hers. He glanced at me briefly, his eyes dark with lust, before turning his attention back to her. “She wants to watch,” he said, his voice low and rough. “And you want to be watched, don’t you, Emily?”

Emily moaned softly, her head falling back against his shoulder. “Yes,” she whispered, her voice barely audible. “Yes, I do.”

Mark’s hands moved up her sides, his fingers tracing the curve of her waist before sliding under the hem of her shirt. He pulled it over her head in one swift motion, tossing it aside. Her bra followed, leaving her bare from the waist up. She shivered as the cool air hit her skin, but Mark’s hands were already on her, cupping her breasts, his thumbs brushing over her nipples until they hardened under his touch.

I couldn’t look away. My breath caught in my throat as I watched him knead her breasts, his fingers teasing and pulling at her nipples until she was squirming against him. Her moans grew louder, more desperate, and I felt a heat building between my own legs, a deep, aching need that I couldn’t ignore.

Mark’s hands moved lower, unbuttoning her jeans and sliding them down her legs along with her panties. She stepped out of them, standing naked before us, her body trembling with anticipation. He turned her around to face him, his hands roaming over her body, exploring every inch of her as if he were memorizing her.

“You’re so beautiful,” he murmured, his voice thick with desire. He leaned down, capturing her lips in a deep, hungry kiss. His hands gripped her ass, pulling her closer as he ground his hips against hers, the bulge in his pants pressing against her stomach.

Emily’s hands fumbled with his belt, undoing it quickly before pulling down his zipper. She reached inside, freeing his cock, already hard and throbbing. She wrapped her hand around it, stroking him slowly, her eyes never leaving his.

“Fuck me,” she whispered, her voice trembling with need. “Please, Mark. Fuck me.”

He didn’t need to be told twice. He lifted her up, her legs wrapping around his waist as he carried her to the bed. He laid her down gently, spreading her legs wide before positioning himself between them. He looked at me again, his eyes burning with intensity. “Are you sure you want to watch?” he asked, his voice low and husky.

I nodded, my heart racing. “Yes,” I whispered, my voice barely audible. “I want to watch.”

He smirked, then turned his attention back to Emily. He guided his cock to her entrance, the tip pressing against her wetness. He pushed in slowly, inch by inch, until he was buried deep inside her. Emily gasped, her back arching off the bed as she took him in.

Mark began to move, his hips thrusting into her with slow, deliberate strokes. Emily’s moans filled the room, growing louder with each thrust. Her hands gripped the sheets, her body writhing beneath him as he fucked her.

I couldn’t tear my eyes away. My own body was on fire, my panties soaked as I watched my husband take my sister. The sight of them together was intoxicating, the sound of their moans and the slap of skin against skin driving me wild.

Mark’s pace quickened, his thrusts becoming harder, more urgent. Emily’s legs tightened around him, pulling him deeper as she cried out in pleasure. Her nails dug into his back, leaving red marks as she clung to him.

“Oh God, Mark!” she screamed, her body trembling as she came undone beneath him. Her orgasm seemed to push him over the edge, and with a guttural groan, he buried himself deep inside her, his release spilling into her.

They collapsed together, their bodies slick with sweat, their breathing ragged. Mark rolled off her, lying beside her on the bed as they both tried to catch their breath.

I sat there, my own body still throbbing with need, my mind racing with thoughts I couldn’t quite process. I had just watched my husband fuck my sister, and instead of feeling anger or jealousy, all I felt was an overwhelming desire for more.

Mark turned to me, a sly smile playing on his lips. “Your turn,” he said, his voice low and inviting.

I hesitated for a moment, then stood up, my legs trembling as I walked over to the bed. I climbed onto it, straddling him as he lay there, still hard and ready. I lowered myself onto him, taking him inside me with a gasp.

As I began to move, riding him slowly at first, I looked over at Emily. She was watching us now, her eyes dark with desire. She reached out, her hand brushing against my arm as she whispered, “Let me help.”

And just like that, the three of us were lost in a world of pleasure, our bodies entwined in a way that was both forbidden and intoxicating.