The air between them grew thick with the scent of sex and sweat, their skin sticking together where their bodies joined. Tatsuki's rhythm faltered as pleasure overtook precision, his movements becoming erratic.
THRUST! THRUST! THRUST! THRUST!
And Yumiko was the first to go. The coil in her abdomen snapped without warning, her entire body arching against Tatsuki's as her climax crashed through her with devastating force.
"Nnngh—T-Tatsuki—!"
Her cry was muffled against his shoulder as her walls fluttered around him in rhythmic pulses, each contraction drawing a ragged groan from his lips. Tatsuki's arms tightened around her, his hips stuttering as he chased his own release.
"Come for me," he breathed against her ear, his voice rough with need. "Let me feel you—"
The words sent another wave of pleasure crashing through her. Yumiko clung to him as his thrusts lost all rhythm, becoming shallow and desperate as he teetered on the edge.
Then—
"Yumiko—!"
Tatsuki buried himself to the hilt with a guttural cry, his release spilling deep inside her in hot pulses that seemed to go on forever.
SPURTTT! SPURRRTTTT! SPUUUURRTT! SPUUUURRTT!
They remained locked together for several breathless moments, Tatsuki's forehead pressed against hers as they both struggled to catch their breath.
Slowly, carefully, Tatsuki lowered her back to the bed, his softening length slipping free with a quiet sound. Yumiko's legs trembled as she sank into the mattress, her body humming with satisfaction even as guilt began creeping in at the edges of her consciousness.
Tatsuki's fingers brushed a damp strand of hair from her forehead, his touch unexpectedly tender. "Alright?" he murmured, his dark eyes searching hers.
Yumiko nodded weakly, her eyelids fluttering shut.
The humid air clung to Yumiko's skin as she lay sprawled across the rumpled sheets, her chest rising and falling in uneven rhythms.
Tatsuki's fingers traced lazy patterns through the mess on her thighs, collecting their mingled essence with a fascinated hum.
"Look at this," he murmured, lifting glistening fingers between them. The dim light caught the sticky strands stretching between his digits. "You're absolutely dripping."
Yumiko's breath hitched. She should feel ashamed. Should scramble to clean herself up. But something darker uncoiled in her belly as she watched their fluids glisten on his skin.
Yui will never see him like this, right?
The thought came unbidden, sending a thrill through her that had nothing to do with modesty. Before she could overthink it, her tongue darted out to wet her lips.
Tatsuki's eyes darkened. "Want a taste?" His voice dropped to that rough whisper that made her thighs press together.
She hesitated—just long enough to pretend she wasn't aching to do this—before nodding. Her cheeks burned as she parted her lips, letting him slide two fingers into her mouth.
The flavor burst across her tongue—musky, salty, wrong in ways that made her stomach flip even as she sucked gently. Tatsuki's groan vibrated through the mattress where his free hand gripped the sheets.
"Fuck, Yumiko," he breathed, watching her tongue swirl around his fingers. "You're full of surprises."
She released his fingers with a soft pop, licking the last traces from her lips. "Not so bad," she lied, her voice trembling only slightly. The aftertaste lingered and she found herself chasing it with another swipe of her tongue.
Tatsuki chuckled, low and knowing. "Liar." His thumb brushed her bottom lip. "You like it."
Yumiko opened her mouth to protest, but the words died when his other hand cupped her between her thighs. Her hips jerked instinctively, her body betraying her again.
"See?" His fingers stroked through her slickness, gathering more. "Still wet for me."
The sweat cooling on Yumiko's skin brought reality crashing back.
She stared at the ceiling, Tatsuki's warmth pressed along her side, his fingers tracing nonsense patterns on her stomach. The digital clock on the nightstand glowed 3:17 AM. Down the hall, Yui's bedroom door remained firmly shut.
Her best friend.
Her best friend's boyfriend.
The weight of what they'd done settled in her chest like a stone.
Tatsuki's fingers stilled. "You're tensing up."
Yumiko swallowed hard. "We shouldn't have—"
"I know." His hand slid up to cradle her jaw, turning her face toward his. Moonlight caught the satisfied gleam in his dark eyes. "But we did."
The simple acknowledgement sent heat curling low in her belly. Her traitorous body remembered—the stretch, the fullness, the way he'd groaned her name like a prayer.
Tatsuki's thumb brushed her bottom lip. "Regrets?"
She should say yes. Should gather her clothes and leave. Should care more than she did.
Instead, Yumiko found herself whispering. "Not enough."
The confession hung between them, raw and honest. Tatsuki's breath hitched before he rolled atop her again, his body slotting between her thighs with terrifying ease.
"Then don't think," he murmured against her throat, his lips hot on her pulse. "Just feel."
And oh, she did. As his hands rediscovered her body, Yumiko let herself drown in the sensation—the delicious wrongness of it all. Somewhere beneath the pleasure, guilt nagged like a persistent itch.
But when Tatsuki's mouth found hers again, swallowing her moans, Yumiko decided some sins were worth burning for.