Give her what she asked for—don't hold back, take her hard

You pull back—almost all the way out—and slam forward.

The thrust is hard, deep, and uncompromising. Your cock drives into her in a single stroke that bottoms out against her cervix, and the impact of your pelvis against hers sends a shockwave through both your bodies. Lina's back arches off the mattress like a bowstring, her mouth opening in a silent scream. Her fingers claw at the sheets, bunching the cotton into white-knuckled fists.

Then the sound comes—a raw, guttural groan torn from somewhere deep in her chest. Not pleasure. Not entirely. Pain lances through it, sharp and unmistakable, and you feel something give way inside her—the thin membrane of her hymen tearing against the head of your cock as you drive through it. A slick warmth spreads between you that's different from arousal, slightly thicker, and you know without looking that there's blood.

The sound she makes hits you like a fist to the sternum because you've heard it before.

Jane made the same sound. The same sharp intake of breath, the same guttural cry that was half surprise and half something primal. In a cramped dorm room with fairy lights strung above the bed, Jane had looked up at you with those same brown eyes—wider, softer, less fierce—and made that exact noise when you pushed inside her for the first time. The memory crashes over you uninvited, superimposing itself on the present like a double exposure, and for one disorienting heartbeat you can't tell which sister is beneath you.

Lina's eyes snap open. She felt it—the memory surfacing in your mind, broadcast through the psychic link the compound has forged between you. Her expression fractures, something raw and complicated flickering across her features. Grief. Recognition. Jealousy. Want.

"Don't stop," she hisses through her teeth. "Don't you fucking stop."

You don't. You pull back and thrust again, hard, setting a punishing rhythm that drives your cock into her tight, bleeding pussy with each stroke. The friction is incredible—her cunt grips you like it's trying to hold you in place, the inner walls clenching in rhythmic spasms around your shaft. Each thrust pushes a wet sound from between your joined bodies, obscene and visceral in the quiet bedroom.

Then something happens.

Lina's left breast swells. Not gradually—it inflates like a balloon, the modest curve ballooning outward into a heavy, round shape that strains against gravity. Her right breast follows a half-second later, both surging from their natural size to something approaching a DD cup in the span of two heartbeats. The skin stretches taut, her nipples darkening and hardening into thick, prominent peaks.

"What—" she gasps, looking down at herself, her eyes going wide.

Her hips widen beneath you, the bones shifting with an audible creak, her waist cinching while her thighs thicken with new muscle and soft flesh. She's taller suddenly—you can feel it in the way her legs extend past where they were, her feet sliding further down the mattress. Her body is flickering between her human form and her diamond form like a television losing signal.

Her left forearm crystallizes. The skin hardens into faceted, translucent diamond from elbow to fingertip, catching the evening light in brilliant prismatic flashes. A patch on her right thigh goes next—a shard of diamond spreading across her skin like frost on a windowpane. Her collarbone glitters, then her jaw, then a strip running down her sternum between those impossibly swollen breasts.

"Shit—shit—" Lina's voice warps mid-syllable, dropping into the lower, smoother register of her diamond persona before snapping back to her human pitch. Her eyes flash blue—glowing, electric blue—then brown again. Her hair bleaches white from the roots for an instant before the dark color floods back.

Her pussy clenches around your cock so hard it's almost painful, the walls pulsing with a heat that goes beyond biological—something deeper, molecular, as if the diamond transformation is trying to happen from the inside out. You feel the texture change around your shaft for one terrifying second—smooth crystalline hardness pressing against sensitive flesh—before it softens back to yielding, wet human tissue.

"I can't—my powers are—" She's panting, her chest heaving, those enormous breasts rising and falling with each ragged breath. Diamond patches bloom and fade across her body like bioluminescence—her shoulder, her hip, the curve of one cheek. Her proportions keep shifting: waist narrowing, hips flaring, then snapping back to her natural slender frame. Her breasts deflate partially, then surge again.

"Lina." You grip her face between your hands, forcing her to focus. "Look at me. Stay with me."

Her wild eyes lock onto yours. The diamond patches are receding now—her left arm fading from crystalline brilliance back to warm brown skin, the facets on her thigh smoothing away. Her breasts settle, shrinking back from their inflated state, though they remain slightly fuller than before—swollen and tender, the areolae flushed dark. Her body stops its chaotic reshaping, her proportions stabilizing back to her natural human form: slender, 5'4", the familiar contours that are hers and not her diamond alter ego's.

She lies beneath you, breathing hard, her skin damp with sweat. A fine tremor runs through her entire body. Her pussy is still wrapped around your cock, still clenching in involuntary rhythmic pulses, and you can feel her heartbeat hammering through the walls of her cunt—rapid, erratic, gradually steadying.

"That was..." She swallows. Blinks. A shaky laugh escapes her, edged with something close to hysteria. "That was new."

Her hands find your shoulders again, fingers digging into the muscle. Her eyes are purely brown now—no glow, no flicker. Human. Present. The tear track on her temple has dried to a faint salt line.

"I'm okay," she says, reading the question on your face before you can ask it. Her voice is rough, her throat working. "The pain just... triggered something. My body panicked." She shifts her hips beneath you—a deliberate, rolling motion that draws your cock deeper into her, and she lets out a long, shuddering exhale. "But I'm here now. I'm me."

Her fingers trace up from your shoulders to the back of your neck. She pulls you down until your forehead rests against hers, her breath hot against your lips.

"And I still want you to fuck me," she whispers. "Harder than that."