His sister Lin Yue's room was right next door.
The wooden sliding door wasn't locked, left slightly ajar.
Su Yu approached, gently pushed the door open, and leaned half her body inside.
"Sis, are you busy?"
But the room was silent, with no response.
Something felt off.
Driven by curiosity, Su Yu slipped off the slippers provided by the bathhouse and stepped barefoot onto the wooden hallway floor. A cool sensation traveled up from the soles of her feet.
Circling around the cherry blossom-painted wooden screen by the entrance, the full view of the room came into sight.
This room was slightly smaller than theirs, but similarly had unpacked luggage sitting in the corner.
In the center of the tatami, her nine-month-old nephew, Shi Ming, lay on his stomach, clutching a plush toy while babbling and blowing bubbles.
The room's heating was turned up high. Though the child wore only a thin onesie, there was no worry about him catching a chill.
As Su Yu glanced around, wondering where her sister had gone, she suddenly heard a heavily suppressed moan coming from the direction of the side bathroom.
"Mmm... ah..."
The sound seemed squeezed from deep in the throat, thick with a nasal tone and trembling, enough to make one's heart race and cheeks flush.
As an experienced player in these matters, Su Yu instantly recognized what was happening.
Her heart leaped violently, and an unbelievable suspicion surged within her.
Could it be...?
Realizing the possibility, Su Yu softened her footsteps, moving as stealthily as a thief toward the closed bathroom door.
Up close, she could see the door wasn't fully latched, leaving an extremely narrow crack from which a sliver of orange-yellow light escaped.
Holding her breath, Su Yu leaned close to the gap, peering through the narrow line of sight into the room.
What she saw, despite her usual boldness, shocked her eyes wide open. She quickly covered her mouth, afraid she might make a sound.
There, seated unceremoniously on the gleaming toilet in the bathroom, was Lin Yue.
This usually poised and intellectual older sister was now tilting her head back, her wavy long hair disheveled and cascading over her shoulders. Her beautiful face was flushed, brows furrowed, lips slightly parted to reveal pearly white teeth, as if she were enduring immense pleasure and torment.
Her deep purple form-fitting knit dress had been pushed up to her waist, exposing a black nursing bra. Her ample E-cup breasts strained against the bra, and due to extreme arousal, her nipples had hardened like stones, pressing against the thin lace fabric.
What was even more shocking was that the left cup of her bra had been pulled down, exposing a large, light brown nipple to the air. As her body trembled, drops of milky white breast milk were actually seeping out!
Drip... drip...
The milk slid down the full curve of her breast, dripping onto her legs. The lewdness of the scene was overwhelmingly intense.
Looking further down...
The black pantyhose had been pulled down to her knees, tightly constricting her calves. Her long, pale legs were spread wide apart in an extremely shameless M-shape, leaving her most intimate core completely exposed.
The legendary "white tiger" that countless men fantasized about was smooth as jade, without a single stray hair, resembling a freshly steamed bun. Only the tender pink slit in the middle was opening and closing, secreting glistening honey.
At this moment, Lin Yue's hand was frantically rubbing against that bun-like slit. Her middle and ring fingers were deeply embedded in the fleshy crevice, rapidly thrusting and probing, each withdrawal pulling out strands of sticky fluid.
"Squelch... squelch..."
The distinct wet sounds echoed in the confined space, particularly jarring.
"Ah... so itchy... I can't take it... little brother..."
While pleasuring herself, Lin Yue murmured incoherently, her other hand forcefully kneading her milk-leaking breast with such intensity that red marks were left behind.
So... this is how women masturbate?
Su Yu felt her mouth go dry, her heart pounding so fiercely it seemed about to leap out of her throat.
She had never tried masturbating before.
Since being with Lin Zhe, her body had been thoroughly awakened. Every time, it was a real, substantial penis filling her—why would she need her own fingers?
In her view, wasn't that hard, burning hot cock ten thousand times more satisfying than these slender fingers? The pleasure of being roughly stretched open and having her cervix fiercely pounded—how could the feeble friction of fingers compare?
Truly, those who are well-fed cannot understand the hunger of others.
As for Su Yu, watching Lin Yue's insatiable appearance, she felt both shocked and a vague, indescribable sense of superiority... along with a strange excitement.
Was her sister... thinking about Lin Zhe?
She had heard that murmured "little brother" clearly just now.
Who would have thought that this woman, who usually played the role of a good older sister, would secretly fantasize about her younger brother while pleasuring her own lewd, milk-leaking body with her fingers!
Su Yu felt a damp heat between her legs, the desire she had just forcibly suppressed surging back again.
Unconsciously, she had become completely engrossed in the scene, entirely unaware of the soft footsteps approaching from behind.
Lin Zhe had originally come to call his wife back and ask if his sister wanted to join them for a hot spring bath.
As soon as he stepped inside, he noticed the outer room was empty. Just as he was about to call out loudly, he caught sight of his wife crouched by the bathroom door, her round, enticing buttocks—the very sight that drove him wild—poised in the air like a furtive thief.
The pose was utterly alluring.
Beneath her tight miniskirt, the two peach-like curves, encased in black stockings, were raised high, tracing a perfect arc.
A playful impulse seized Lin Zhe. He crept over silently, raised his hand, and delivered a crisp slap to that soft, plump flesh.
Smack!
"Darling, what are you looking at?"
Su Yu was startled out of her wits, her body jolting violently as she couldn't hold back a sharp cry.
"Ah!"
Turning her head and seeing it was Lin Zhe, her pretty face instantly flushed crimson, her eyes filled with panic.
Remembering her sister was in the bathroom, she quickly raised a finger to her lips, signaling for silence.
"Shh..."
That flustered, guilty expression, as if caught in the act of spying, sent a thrill of desire coursing through Lin Zhe.
Yet, he was puzzled by his wife's behavior and lowered his voice to ask, "What's going on? Why all the secrecy?"
Without waiting for Su Yu to stop him, Lin Zhe reached out and pushed the slightly ajar door.
Creak—
The soft sound echoed like thunder in the quiet room.
Inside the bathroom, Lin Yue, teetering on the edge of climax, shuddered violently.
Lost in a fantasy of being roughly taken by her brother, her mind filled with the image of an imaginary, massive cock pounding relentlessly against her cervix, the sudden intrusion of that very voice she yearned for in reality froze her in place.
Her mind went blank.
Her fingers remained buried in her slick, wet pussy, forgotten in the shock.
The door swung open.
Lin Zhe, grumbling under his breath, casually glanced inside.
What met his eyes made him freeze in astonishment.
The scene seemed suspended in time.
Lin Yue was frozen in an utterly humiliating pose:
Her clothes disheveled, breasts exposed and leaking milk, legs spread wide, fingers thrust deep inside herself.
Her usually seductive, dreamy eyes were now wide with terror and despair, the lingering flush of arousal on her face a stark contrast to her shame.
The smooth, bare lips of her pussy continued to pulse unconsciously from the earlier stimulation, like a hungry little mouth waiting to be fed.
Lin Zhe's gaze shifted between her milk-dripping breasts and the fingers buried in her cunt, his throat dry, his cock hardening to an almost painful intensity.
The visual impact was overwhelming.
At that moment, his sister Lin Yue resembled a bitch in heat, shamelessly pleasuring herself.
And clearly, the object of her desire was him.
The silence stretched for a full three seconds.
Lin Zhe took a deep breath, a sly, wicked smile slowly curling his lips.
His eyes roamed brazenly over his sister's exposed private parts as he broke the deathly stillness with a low, teasing voice:
"Sis... I'm right next door. If you wanted it, why not come to me directly? Was it really necessary to hide in here and use your fingers?"
Hearing this, Lin Yue lifted her head. Her face, usually radiating a mature, domineering charm, was now a mask of panic and hurt.
Tears welled in her eyes but stubbornly refused to fall. Her gaze held both the intense shame of being caught in such a disgraceful act by her brother and a subtle, unspoken resentment—a desperate longing to be filled.
Just moments ago, her fingers had been moving in and out of that damp, slick cavity, fantasizing about her younger brother's burning hot member, seeking a sliver of solace.
But now, the object of her fantasy stood right before her, wearing a wicked grin. His gaze felt almost tangible, roughly caressing every inch of her skin.
And as Lin Zhe watched his sister's pitiful, tearful expression, the sinful fire in his lower abdomen surged instantly, burning away all reason.
The fire that Su Yu had stirred up earlier was still burning inside him, with no outlet for release. His sister's budding, unresisting demeanor was like a ready-made remedy delivered right to his doorstep.
Without giving Lin Yue a chance to explain or beg for mercy, Lin Zhe strode into the room.
The air was thick with the scent of his sister's arousal, so provocative it drove him wild.
Without a word, Lin Zhe domineeringly reached out and wrapped his arm around Lin Yue's slender, supple waist.
"Ah…"
Lin Yue let out a soft gasp, her voice trembling with a seductive weakness.
In the next moment, she was lifted into the air.
The sensation of weightlessness, mixed with shame, made her instinctively try to close her legs to hide her intimate parts. But the stockings, pulled down only halfway, became the perfect restraint, leaving that tantalizing glimpse of her even more brazenly exposed to her younger brother's gaze.
Overwhelmed with desire, Lin Zhe carried his sister out of the bathroom in a few quick strides, entering the Japanese-style room with its tatami flooring.
Not far away, Xiao Shiming remained lying on the floor, playing with his stuffed toys, completely unaware that his mother was about to be entangled with his uncle once again.
The forbidden nature of the scene didn't evoke any guilt in Lin Zhe. Instead, it doubled the thrill of their immoral act.
As if continuing their morning encounter, Lin Zhe gently laid Lin Yue down on the tatami.
He didn't let her lie flat but instead turned her onto her side.
Lin Yue's long, wavy black hair cascaded over the pillow, a few strands clinging to her flushed cheeks, adding to her alluring charm.
Her deep purple knit dress was still bunched around her waist. The black nursing bra she wore on her upper body was half-unhooked, barely containing her enormous E-cup breasts.
From her earlier self-stimulation, her nipples had hardened like two dark purple grapes, now trembling slightly with shame, even glistening with a few drops of milk, emitting a faint, milky fragrance.
The view below was even more breathtaking.
The black stockings hung around her knees, accentuating the snowy whiteness of her thighs. Her plump, rounded buttocks, slightly raised in her side-lying position, resembled a ripe peach, begging to be bitten.
Her hairless entrance pulsed with each breath. Even without touching her, Lin Zhe could see the inner folds writhing wildly, craving intrusion.
Unable to hold back any longer, Lin Zhe hastily unbuckled his belt.
Snap!
The button flew open.
Next, a thick, veined, and menacing member sprang free, swaying in the air with scorching heat, aimed directly at her drenched entrance.
Lin Zhe pressed closer, aligning himself against Lin Yue's side.
One hand roughly reached around her armpit, grabbing hold of her heavy, full breast.
The sensation was astonishingly soft, like warm dough, his fingers sinking deep into its pliancy—a texture only achieved after breastfeeding, surpassing even Su Yu's breasts.
"Sis, I'm going in."
Hearing her brother's lust-filled words, Lin Yue turned her head, casting a seductive, half-lidded glance his way. The resistance from earlier had vanished entirely, replaced by intense desire and submission.
"Mmm… be gentle… don't scare Xiao Ming…"
Lin Zhe understood.
The next moment, squelch!
The massive glans slid in with astonishing smoothness, breaking through layer after layer of resistance, plunging straight into her sister Lin Yue's sopping wet, beautifully bare pussy.
"Ah... so big... my little brother's huge cock... so deep..."
Unexpectedly, it was Lin Yue who broke their pact first. As the thick shaft buried itself completely inside her, she arched her neck back in ecstasy, releasing a series of moans brimming with utter satisfaction.
It was like a long drought finally meeting sweet rain—the hollow, frustrating itch she'd felt while masturbating was instantly replaced by an overwhelming sense of being stretched, possessed, and penetrated. Every fold inside her was filled by the scorching hot flesh, sending such intense pleasure that her ten jade-like toes curled tightly.
Lin Zhe didn't immediately start thrusting wildly. Instead, he began to grind slowly, his glans circling deep within her sensitive core. Each rotation brushed against countless erogenous zones, making Lin Yue's delicate body tremble uncontrollably as fragmented moans spilled from her lips.
"Husband... it feels so good... right there... more..."
In that moment, Lin Yue was completely lost. Morality, identity—none of it mattered anymore. All she wanted was to be a shameless slut under her brother's massive cock, to feel his burning seed fill her up as soon as possible.
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