Firefly

"So, is this really part of your treatment?" Shirou tilted his head, fingers brushing the edge of Firefly's hips.

She exhaled sharply through her nose, lips pressing together—not quite a laugh, not quite frustration. "You're asking now?"

Shirou's palms slid up the sides of her ribcage, fingers pressing lightly into the warm spaces between bones. His thumbs traced the underside of her breasts as he leaned in, the scent of her skin.

"I'm mean, yeah," Shirou murmured against the curve of her neck, his breath hot where it ghosted over her collarbone.

"Well, I was recommend physical therapy—" Firefly arched her back sharply when Shirou's teeth scraped just below her ear.

He grinned. "Well then, I suppose we should take this very seriously." His hands slid downward again, fingers tracing teasing circles over her hips before dipping between her thighs. She gasped—soft, involuntary—her body tensing as his fingertips brushed against her slick heat. Shirou exhaled against her throat, low and satisfied, before pressing two fingers inside with deliberate slowness. Firefly's breath hitched, her nails digging into his shoulders as he curled them just right, the rough pads of his fingers dragging against her inner walls in a way that made her hips jerk forward instinctively.

"Looks like you're already—" Shirou's voice tangled against her ear, half laugh, half groan, as aligned his cock against her entrance, the blunt head catching just enough to make Firefly inhale sharply through clenched teeth. His hips rolled forward in one smooth motion, burying himself to the hilt with a grunt.

She choked on air, her thighs clamping around his hips, the sudden stretch burning in the best way—like the first lick of ice-cream cone after a long day, all heat and unraveling.

Firefly tipped her head back, exposing the long line of her throat as Shirou withdrew almost completely before thrusting back in with a snap of his hips. The impact knocked a ragged moan from her lips—half-formed syllables that dissolved into sharp, punched-out breaths as he set a punishing rhythm. His palms slid up to cup her breasts, thumbs brushing over her nipples in time with each deep, rolling stroke. The rough friction sent sparks arcing down her spine, pooling low in her belly where their bodies joined.

She could feel every ridge of him, the way he stretched her impossibly wider with each forward roll of his hips. The wet, obscene sound of their skin meeting filled the space between them, underscored by the creak of the bedframe beneath them. Shirou’s breath came hot against her ear, uneven, his fingers tightening around her waist as he angled her hips higher, forcing her to take him even deeper. Firefly’s vision blurred at the edges, her thighs trembling with the effort of keeping up, of meeting each thrust with a roll of her own hips.

Then his hands—rough, insistent—pushed her shoulders down, pressing her into the mattress. She barely had time to gasp before he pulled her hips back, kneeling behind her, one hand braced against the small of her back. The sudden shift made her moan low in her throat, her fingers twisting into the sheets. The new angle was sharper, more merciless—every inch of him dragging against sensitive nerves she hadn't even known existed. Firefly arched, trying to relieve the delicious pressure, only to feel his hands grabbing hold of her hips.

Then with a growl, Shirou flipped Firefly onto her hands and knees—one smooth motion that left her gasping against the sheets. The sudden shift sent a sharp thrill through her, the cool air against her sweat-slicked back making her shiver even as the heat between her thighs burned hotter. His grip on her hips was possessive, fingers digging in as he dragged her backward onto him, the thick length of him sliding home with a wet, filthy sound that punched a moan from her lips.

Firefly’s arms trembled, her elbows threatening to buckle from the sheer **** of each thrust, but she clung to the sheets, knuckles whitening as the bedframe creaked beneath them.

The sensation of him—hot, unrelenting—sent a shudder rippling through her, her walls fluttering around him in involuntary pulses. She couldn’t tell if it was his rhythm, the angle, or the way his fingers dug into the meat of her hips, but something coiled tighter inside her with every snap of his pelvis against her.

Then it snapped—the coiled tension inside her unraveling in a single, searing wave that ripped through her with teeth. Firefly's back arched violently, her mouth falling open in a silent scream before sound finally tore free—a ragged, choked moan that dissolved into shuddering gasps as pleasure radiated outward in electric pulses. The world blurred beyond the frantic hammering of her heartbeat in her ears, her fingers clawing uselessly at the sheets as her thighs trembled, muscles locking tight around Shirou's thrusts.

She couldn't breathe, couldn't think beyond the white-hot burst of sensation scorching through her veins, every nerve alight like live wires under her skin.

Shirou's hips stuttered against her, his rhythm fracturing as her body clenched around him, squeezing impossibly tight. A low, guttural noise tore from his throat—half curse, half prayer—as he buried himself deep, releasing his climax in hot pulses that had Firefly whimpering at the oversensitivity, her own pleasure still rippling through her in aftershocks.

She felt his seeds in her womb, spilling warm against her sensitive walls.

Her eyelids fluttered shut, breath coming in shallow gasps as Shirou collapsed against her back, his weight pressing her deeper into the mattress. His lips found the nape of her neck—damp, open-mouthed kisses that trailed shivering sparks down her spine while his fingers traced idle circles over her hipbone. Firefly could feel him softening inside her, could feel the slow trickle of his release leaking out around where they were still joined, sticky and warm against her trembling thighs.

The scent of sex clung thick to the air—salt, sweat, and something muskier—and she inhaled sharply.

Firefly's vision swam as her orgasm crested, she felt the loss of control—not just in her trembling limbs or the way her breath ragged, but deeper.

The pulsing path energy of propagation coiled inside her womb, reacting to Shirou's seed with a hunger that made her gasp. It wasn't just pleasure anymore—it was something deeper, something ancient, twining through her nerves like vines reaching for sunlight. Firefly's fingers dug into the mattress as her body arched again without her permission, muscles locking around him as the energy surged outward in a wave that left her shaking. She could *feel* it—the way her cells split and multiplied at an impossible rate, the way her skin tingled as if electrified.

Her vision whited out completely for three terrifying heartbeats before resolving into fractured snapshots—a meadow bathed in twilight, tiny hands grasping at her fingers with impossible warmth.

Firefly blinked rapidly, her breath still catching in her throat as she tried to process the vision. Was that a hallucinations? A premonition?

Her thighs trembled as she rolled onto her back, staring up at the ceiling while Shirou's fingers traced lazy patterns across her stomach. The afterglow hummed beneath her skin, but the vision—that impossible flash—clung to the edges of her awareness like static. She swallowed hard, her throat dry. "I think I might need to get another checkup," she muttered, voice unsteady.