Cover of The Sister Pact

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Girlfriend fulfills boyfriend's wish and brings her twin half-sister to have sex with him.

Chapter 1: The Proposition

The lamp on the nightstand flickered, casting nervous shadows across the ceiling. The room smelled of dust, old paper from the stacks of books lining the floor, and the sharp, clean scent of Ethan’s sweat. Clara moved above him, a pale silhouette against the dark. Her long red hair brushed his chest as she leaned down, her lips close to his ear.

“I asked her,” she whispered. Her voice was a thread of sound, nearly lost in the quiet. “She’s here.”

Ethan’s hands, which had been tracing the notches of her spine, stilled. For a second, the only movement was the pulse jumping in his throat. “Clara.”

“Don’t.” She pressed a finger to his lips. Her green eyes were wide, earnest, searching his face in the dim light. “You told me. That night, after too much wine, you finally said it. You think about her. You… wonder.”

He swallowed. The confession had felt like a poison leaving his body, a secret so dark he’d immediately tried to take it back. But she’d held onto it. Nurtured it. “It was a stupid thought. A fantasy. It doesn’t mean—”

“It means you want it.” She shifted, straddling him more firmly. Her expression was a turbulent mix of devotion and wild impulsivity. “I love you. I want you to have the things you want. Even the… complicated ones.”

“She’s your sister,” he said, the word ‘half’ sticking in his throat, feeling like a technicality, a weak excuse.

“And she’s my best friend.” Clara’s smile was fragile, a little broken. “She understands. I explained it. How strong we are. That this is just a gift. For you. From me. Through her.”

Ethan’s mind spun. The moral architecture of his life groaned under the weight of this. He looked at Clara—her slender frame, the artistic flutter of her hands as she spoke, the absolute conviction in her eyes. She had painted this moment in her head, a daring, taboo masterpiece, and she was offering it to him on a platter. His desire, a gnawing, shameful thing, uncoiled in his gut. It battled with a deep, churning guilt.

“Where is she?” he heard himself ask. The question felt like it came from someone else.

Clara’s eyes flicked toward their bedroom door. It was closed. Behind it, the silent apartment. “Living room. She’s just… waiting. For me to tell her it’s okay.”

“Jesus, Clara.” He ran a hand over his close-cropped hair. His bicep tightened, a cord of tension. “This is insane.”

“Is it?” She tilted her head. “Or is it just honest? You want her. I want to give her to you. She’s willing. For one night. No strings. No changes.” She cupped his face. Her fingers were cool. “Let me do this for you. Let me be part of it. Let me watch.”

The air left his lungs. The image slammed into him, unbidden, visceral. He closed his eyes, but it only grew clearer. His body reacted, a traitorous, undeniable response beneath her.

Clara felt it. A slow, knowing smile touched her lips. She leaned down again, her mouth grazing his. “That’s my yes,” she murmured. She kissed him, deep and lingering, then pulled back. “Stay here.”

She slid off the bed, her movements fluid, decisive. The worn floorboards didn’t creak. She was a ghost in her own home, padding to the door. She wore only his t-shirt. It draped to her thighs.

Ethan pushed himself up on his elbows. His heart was a hammer against his ribs. “Clara, wait.”

She paused, her hand on the doorknob. She looked back over her shoulder, the flickering light carving her profile from the darkness. She didn’t speak. Just waited.

All his objections, his morals, they piled up in his throat and then dissolved, ash on his tongue. He wanted it. God help him, he wanted it more than he wanted to be a good man. He gave a single, almost imperceptible nod.

Clara’s smile was brilliant, triumphant. She turned the knob and slipped out.

The room was suddenly cavernous, empty. Ethan sat up fully, the sheet pooling at his waist. He stared at the poster on the wall, some band from their teenage years, the corners torn. It was a relic from a simpler time. He listened. The silence from the living room was absolute, thick, pressing against his ears.

Then, a murmur of voices. Clara’s, low and reassuring. Another, softer, hesitant.

A floorboard sighed in the hallway.

His breath hitched.

The door pushed open wider. Clara entered first, her eyes bright, holding his gaze. She came to the side of the bed and took his hand, lacing her fingers with his. A anchor. A tether.

Then she moved.

Sophia stepped into the frame of the doorway. She was a echo of Clara—similar height, similar grace—but where Clara was fire and impulsive curves, Sophia was moonlight and quiet angles. Her hair was a shade darker, a deep auburn pulled into a loose knot. She wore a simple slip of charcoal grey, the straps thin on her shoulders. She wasn’t looking at him. Her gaze was fixed on Clara, a silent question hanging between them.

Clara nodded, squeezing Ethan’s hand. “It’s okay,” she whispered, though the room was so quiet they all heard it.

Sophia’s eyes, the same shade of green as her sister’s, finally lifted and met Ethan’s. There was no smile. No seduction. Just a profound, unsettling stillness. An acceptance. She took one step into the room, then another, the distance closing.

Ethan’s world narrowed to the space between them, to Clara’s tight grip on his hand, to the silent woman approaching his bed. The fantasy was over. The complicated, terrifying, desired reality had just begun.

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