The bedroom was drenched in the soft haze of afternoon sun, golden warmth spilling across tangled sheets, scattered clothes, and the bare bodies that had only just paused for breath. Shin leaned against the headboard, one hand running lazily through Ai's damp, tousled hair as she lay sprawled on his chest, her lips still slightly swollen, her cheeks flushed from more than just exertion.
He chuckled under his breath, a teasing edge in his voice.
"You know," he murmured, tilting her chin up to meet his gaze, "it's kind of funny how you acted all shy this morning. Blushing, hiding your face—like some innocent little flower. And now look at you."
Ai's eyes narrowed, a coy smirk curving her lips as she shifted, brushing her body slowly against his with deliberate teasing. "Mmm… I acted that way because Onii-chan loves it when I do."
Shin raised a brow. "Oh?"
She leaned up, their faces inches apart, her voice low and syrupy sweet. "You get that look in your eyes. That one where you want to ruin me."
He caught her waist with one hand, dragging her closer as she straddled his lap again. "That so? Maybe I just like the contrast — how my cute little sister goes from shy to… this."
Ai gave a pleased giggle and wriggled in his grip, her bare skin brushing against his as she draped her arms around his shoulders. "You love me like this. Admit it, Onii-chan."
Shin's hands slid up her back, fingers tracing her spine with maddening slowness. "I love every version of you," he said simply, voice thick. "But this bold, teasing Ai who only ever calls me Onii-chan when she wants to make me lose control? Yeah… she's dangerous."
Ai's smirk widened. "Then you better hold on tight."
With a sudden shift, she leaned in and kissed him — not gentle, not tentative. It was a kiss filled with hunger, with a need that had barely waned since the morning began. Her lips moved against his with practiced ease, tongue teasing, tasting, claiming.
Shin responded instantly, one hand gripping her waist while the other tangled in her hair, pulling her in deeper. The kiss turned messy, wet, a clash of tongues and breath as Ai's fingers roamed down his chest, nails raking lightly down his skin.
She gasped softly when he cupped her bare backside and lifted her slightly, adjusting her position with ease. Her thighs clenched around his hips, the friction between them sparking heat that reignited the fire they'd only just barely let die.
Breaking the kiss with a gasp, Ai let her forehead rest against his, breath trembling. "I can't stop, Onii-chan… Every time you touch me, it gets worse."
Shin's voice was gravel. "Then don't stop."
He lifted her again, arms flexing beneath her weight, and stood from the bed in one smooth motion. Ai clung to him with a delighted squeal, pressing kisses along his jaw as he carried her toward the bed again. But instead of laying her down gently like before, he sat on the edge, pulling her with him — back in his lap, chest to chest.
Ai blinked, confused for a second, before gasping when Shin's hands gripped her hips and spread her knees wider across his lap, baring everything between them to the warm air.
"O-Onii-chan!" she whined, covering her face as her body flushed hot with embarrassment. "That's too much!"
"You were just bold a second ago," Shin said with a grin, voice dripping with amusement. "What happened to the confident Ai who said I loved when she acted cute and shy?"
"I didn't mean right now!" she squeaked, hands still over her face as her hips squirmed against his lap. "T-This position… It's embarrassing!"
"That's why I like it," he whispered against her ear, licking the shell before kissing just beneath it. "You look so pretty like this. Flushed and trembling — and all mine."
Ai whimpered, but her hands slowly dropped from her face, revealing her wide eyes, her lips parted, her entire body trembling with anticipation. She rocked her hips once against him — slowly — and gasped again.
"I-It feels… too good," she whispered.
Shin's fingers brushed her thighs again, stroking the soft inner skin as he watched her reaction. "Then let it. I want to see everything."
She groaned, but nodded, giving in as she started to grind her hips more deliberately. Shin watched her closely, completely focused on the way her expression shifted with every roll of her body, every wet sound, every breathless moan.
Ai's voice was breaking now, hitching with every exhale. "O-Onii-chan… kiss me…"
He didn't need to be asked twice. Their mouths met again, tongues tangling, Ai's fingers gripping his shoulders tightly as she rode the slow rhythm they had built. Shin let her take the lead, content to let her explore every angle, every friction that made her twitch and cry out.
As she picked up speed, Ai's head tipped back, her breasts bouncing lightly with each motion. Shin leaned forward, capturing a nipple between his lips and sucking hard, making her cry out and buck harder against him.
"Too sensitive," she gasped, but didn't stop moving.
Shin's hands cupped her ass, guiding her rhythm, pulling her against him again and again, until her thighs trembled and her nails dug into his back. Their foreheads pressed together as Ai's movements grew erratic.
"Close," she whispered, eyes wide and glossy. "Onii-chan, I'm close—"
He bit her shoulder, not enough to hurt, just enough to mark. "Let go."
And she did, without penetration, again.
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END OF CHAPTER : 100 : BECAUSE ONII-CHAN LOVES IT!
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