Steam swirled thick in the large private bath, clinging to the glass walls and curling around the playful chaos unfolding inside. The scent of citrus soap and warm minerals danced through the air, blending with the occasional squeak of wet feet or a sudden splash. Laughter and teasing echoed softly.
At one end of the bath, little Asahi grunted dramatically, his small hands gripping an oversized, fluffy loofah like it was a great warrior's shield. His tiny arms stretched up as he tried to scrub Yuki's slender back. Yuki sat stiff as a board on the edge of a stool, blushing violently, his pale skin turning almost pink as he squirmed under the innocent attention.
"Y-Yuki-Nii, stop moving! I can't reach your shoulder if you keep fidgeting!" Asahi huffed, pushing himself onto his toes.
Yuki bit his lower lip. "I'm not fidgeting! You're just tickling me with that... thing! It's bigger than your head!"
"It's soft!" Asahi argued, voice full of childish conviction. "Soft makes the skin clean and happy!"
Yuki whimpered under his breath, trying not to die from sheer overload. What kind of little gremlin did Shin raise!?
A few feet away, in a pocket of warm, tiled floor beside the bath, Aiko and Ai were engaged in a heated, deeply scientific debate. Their naked bodies glistened with droplets, and both of them sat upright with prideful posture—well, as upright as two bouncy, jiggly girls could manage.
"No, I'm telling you, it's not about mass alone!" Ai flicked her dripping wet hair over her shoulder. "It's the combination of volume and elasticity!"
Aiko scoffed, pointing dramatically. "Excuse me!? I can literally clap mine together and make an echo. That's volume. Yours are just perkier!"
"They respond to motion with a higher amplitude!" Ai declared, giving hers a bounce for demonstration. "That's real physics!"
"Then I'll bounce mine more!"
The two girls started bouncing experimentally, their breasts jiggling in gloriously exaggerated fashion with every slight movement, the slapping noise echoing awkwardly through the steamy chamber.
Yuki was visibly dying.
"I CAN HEAR EVERYTHING," he muttered through clenched teeth, still trapped under Asahi's sponge assault.
Aiko, hearing Asahi giggle, turned her head—and her expression instantly soured with exaggerated jealousy.
"Hey... A-Chan..." she said sweetly, standing up with a dangerous smile and padding toward the two boys. Her hips swayed, and water slid down her curves with sinful grace. "Why are you washing his back before mine...?"
Asahi blinked up, confused but pleased. "Because Yuki-Nii asked first!"
Aiko dramatically pouted. "But I'm your Amu-Chan! You should be spoiling me!" She knelt behind the boy and slipped her arms around him from behind in a warm hug—pressing her slick, heavy breasts against his small back without shame.
Asahi gave a pleased little hum at the hug. "You're squishy..."
"I know," Aiko giggled proudly. "So wash my back next, okay?"
"After I finish Yuki-Nii," he said loyally.
Aiko grinned and tightened the hug just a little. "Okay~ But hurry up. I want your tiny hands scrubbing me~!"
Yuki twitched. "Don't say it like that!!"
Meanwhile, the steamy water rippled gently in the large circular bath. The sound of splashing had quieted, replaced by the occasional sigh.
Shin sat comfortably, back leaning against the edge of the tub, his arms spread lazily along the rim—until one arm wasn't. Ai had draped herself onto his lap, her petite body curled against his chest, eyes half-lidded with deep satisfaction. Her arms wrapped around his neck, her cheek rested against his shoulder, her breath warm against his skin.
"Onii-Chan..." she whispered, voice low and sultry.
"Hm?" Shin replied, trailing his fingers across her bare side underwater—so casually it was nearly unnoticeable.
"I'm happy... when you're with me like this..." Her voice trembled slightly, a thread of emotion laced through the hushed tones. "Even if they're all here... even if we're all together like this... I just want you to touch me more."
His hand slid lower.
She twitched gently against him.
"Touch you more, huh?" he murmured, lips brushing her temple.
Her face flushed. She leaned up and whispered in his ear.
"Put it in me, Onii-Chan. I want you... right now. I don't care if they're here. They won't see it..."
A slow smile curled across Shin's lips. He didn't hesitate.
In one silent, precise movement beneath the surface, he shifted his hips and pulled her closer. Ai gasped quietly, the sound almost inaudible under the hum of running water.
"Mn...!"
His hands gripped her hips under the water, guiding her. Ai shivered, her lips parting in a silent moan as he pressed inside her. The water masked the faintest motion—only the subtlest ripple in her shoulders, only the light tremble in her thighs. Her forehead dropped to his neck.
"No one can see us," she whispered.
"I know," he whispered back. "So stay quiet, Ai."
"I will... I promise..." Her voice was tight, needful. "Just don't stop..."
Shin's fingers gripped harder, and under the surface, he moved her hips. Slowly. Deeply. Ai bit down on her own finger, her expression melting into bliss.
Yuki glanced their way, frowning. "What are they whispering about?"
Aiko was still hugging Asahi tightly. "Who cares? Probably Ai being clingy again."
Back in the tub, Shin's other hand slid up Ai's spine and into her wet hair, gripping it gently. She whimpered against him, her voice muffled against his neck. Her core tightened around him.
"You're being such a good girl right now," Shin breathed in her ear. "You wanted it so badly, didn't you?"
Ai nodded frantically, her mouth open, her breath shaky. "I love you... I love you, Onii-Chan... always..."
His thrusts remained gentle, deep—hidden by the swirling water and the angle of her body curled against his. No one suspected. Not even Yuki, who still looked suspicious.
"Shin's too quiet..." Yuki muttered.
"Then go interrupt him," Aiko teased.
"Not a chance."
Ai clung tighter, nails lightly scratching down Shin's back, her legs trembling. "Don't stop... don't stop... I'm gonna... I'm...!"
Shin whispered, "Cum for me, Ai."
And she did. Silently. Shaking. Her body tightened around him, her eyes squeezed shut as a wave of pleasure overtook her. She bit down on his shoulder to muffle the sound.
He held her tightly.
After a long, trembling moment, she collapsed against him, still shaking slightly. Her lips kissed his collarbone.
"I love you... forever, Onii-Chan..."
He smiled and kissed her head. "I know, Ai. I'll always make sure you feel that."
And no one ever noticed.
---
END OF CHAPTER : 156 : WHOSE TURN IS IT NOW!
---