Lin Zhe was caught off guard by his wife's sudden "back rub" move and burst into laughter.
But before he could finish laughing, Su Yu had already pressed her incredibly elastic D-cup breasts tightly against his back.
An indescribably soft sensation washed over him, and Lin Zhe instantly closed his eyes in bliss.
Although Su Yu's D-cups were a size smaller than his sister Lin Yue's, they more than made up for it with their astonishing elasticity, firmness, and fullness.
Su Yu pressed her breasts firmly against her husband's back muscles, using them almost like washcloths, and began rubbing in deliberate, circular motions.
Aided by the shower gel, the two soft mounds of flesh deformed and squeezed against Lin Zhe's back. The firm, pink nipples constantly scraped across his skin, sending waves of an indescribable, tingling pleasure.
"Feels good, honey?" Su Yu breathed into his ear.
"Good..." Lin Zhe sighed contentedly.
But Su Yu wasn't satisfied. A surge of jealousy rose within her:
"Then... does it feel better with me, or with your sister?"
This question was practically a death trap.
Lin Zhe, with a strong will to survive, answered: "Of course it's better with you!"
"Hmm?"
Hearing this, Su Yu didn't seem pleased. Instead, her face suddenly darkened, she stopped her movements, and let out a threatening "hmm."
Seeing this, Lin Zhe immediately changed his tune: "Uh... it's better with sis..."
"How is it better?" Su Yu pressed immediately.
Lin Zhe stammered, telling the truth: "She... hers are bigger... softer..."
"Hmph!"
Being compared like this by her husband instantly filled Su Yu's heart with jealousy.
But immediately afterward, an even stronger sense of excitement surged from deep within her.
Just the thought of her sister's large breasts rubbing against her husband's back like this made Su Yu feel the nectar between her legs, in that intimate space, begin to overflow uncontrollably once more.
Jealousy and excitement intertwined, causing the desire within her to rise again.
Su Yu peeked out from behind him and immediately saw the massive, iron-hard dragon between her husband's legs, which she had once again aroused.
Overcome with passion and jealousy, Su Yu released her embrace, quickly walked in front of Lin Zhe, and, under his astonished gaze, slowly crouched down.
Her two snow-white, slender arms wrapped around Lin Zhe's thick thighs, steadying his body.
Then, she lifted her stunningly beautiful face, gave her husband a seductive, sultry look, and, as if in slow motion, opened her red lips and took his thick, burning cock all the way to the base.
"Mmm~~"
Lin Zhe instantly gasped, letting out a groan of immense pleasure. His hands instinctively buried themselves in his wife's damp hair.
Su Yu's fellatio skills were exquisite and breathtaking.
This time, she didn't tease the glans with her tongue but instead used her signature move.
Her sexy red lips enveloped the entire shaft. She paused briefly, took a deep breath, expelled the air from her mouth, causing her lips to tightly suction onto Lin Zhe's base.
In that instant, a negative pressure environment formed in her mouth.
Lin Zhe felt his entire cock being tightly squeezed by warm, soft flesh, like the empty jelly cups from childhood, squeezed flat and suctioned onto a hand or face.
Immediately after, Su Yu began moving her head back and forth, mimicking the motion of actual penetration.
"Gulch... gulch... gulch..."
The sounds of water and rhythmic sucking echoed in the bathroom, creating an exceptionally lewd atmosphere.
"Gurgle... gurgle... gurgle..."
As Su Yu's movements grew wider, Lin Zhe felt an intense pulling sensation, as if his big cock was about to be sucked away. Waves of continuous, tingling pleasure shot straight from his glans to the crown of his head.
Lin Zhe's face contorted with effort. He clenched his teeth tightly, and all his muscles tensed as he barely managed to resist the powerful urge to ejaculate.
"Hss... wife... slower... ah..."
Hearing this, Su Yu not only didn't slow down but, as if punishing him, increased her speed. Deep in her throat, she made "heh heh" swallowing sounds.
This continued for nearly a minute. Lin Zhe felt he was truly reaching his limit.
When you can't bear it any longer, there's no need to bear it. Lin Zhe placed both hands on the head of his wife, who was wholeheartedly serving him, and panted:
"Wife... look... at me."
Su Yu wasn't really holding a grudge. Obediently, she stopped moving and slowly raised her beautiful face.
At this moment, her hair was soaked and clung messily to her cheeks. Her seductive eyes were already glazed over, her face flushed with passion. Her mouth was stretched full by her husband's thick length, her cheeks slightly hollowed, and a strand of transparent saliva dripped from the corner of her lips.
This pitiful yet utterly debauched appearance, combined with the face even her sister Lin Yue envied, could be described as devastatingly beautiful without exaggeration. Lin Zhe instantly felt a weakness in his waist, and the floodgates burst open.
"Ah...!"
With a muffled groan, Lin Zhe thrust his hips forward an inch.
The next second, "Squirt, squirt, squirt..."
Stream after stream, wave after wave of scalding semen, no less abundant than before, erupted, shooting deep into Su Yu's mouth.
In the next instant, Su Yu's throat produced a series of "gurgle, gurgle" sounds. Without wasting a single drop, she swallowed every last bit of her husband's fourth ejaculation.
Only when Lin Zhe's cock had completely gone limp did Su Yu release it with a "pop."
"Hah~~ Hah~~"
After spitting out the cock, Su Yu's cheeks ached. As if oxygen-deprived, she opened her mouth wide, panting heavily, causing the two snow-white rabbits on her chest to bounce up and down.
More than ten seconds passed before Su Yu recovered from this move that hurt the enemy a thousand but herself eight hundred. She wiped the corner of her mouth with her fair, jade-like hand but pretended to complain with dissatisfaction:
"Honey, why did you cum so fast? I hadn't even used my full strength yet~"
"Was it because sister's technique isn't good, so your threshold got lower?"
Lin Zhe was still basking in the afterglow of the blowjob. Hearing this, he couldn't help but chuckle.
He knew his wife's little thoughts all too well.
On the surface, Su Yu seemed jealous of her sister, but in reality, she was probably enjoying this forbidden family dynamic more than anyone.
Her mention of sister Lin Yue was less about jealousy and more about excitement.
And now, using her exquisite oral skills to forcibly drain him dry wasn't about revenge either; it was a way of asserting her dominance.
She wanted to prove to him through action that even if her sister's breasts were bigger, even if their mother had entered the picture, she, Su Yu, would always be the one in this house who understood him best, satisfied him most, and would always be his woman—the rightful wife.
It was an incredibly complex form of play, mixed with possessiveness, competitiveness, and shared descent into depravity.
Understanding this, Lin Zhe felt even more love and tenderness for his wife.
"Well, that just shows how amazing you are, Miss Su Yu."
As he spoke, Lin Zhe affectionately stroked her beautiful cheek.
"Cheeky~"
Su Yu gave him a flirtatious, sidelong glance, her little competitive heart feeling immensely satisfied.
Immediately after, she stood up, parted her fair, slender legs, and prepared to walk under the showerhead to rinse off the foam on her body and the taste in her mouth.
But just as she took her first step...
"Shh!"
Lin Zhe suddenly grabbed her, his expression changing. He made a shushing gesture.
Su Yu was startled, but her quick-witted alertness kept her from panicking. Following her husband's gesture, she mouthed silently:
"What's wrong?"
Lin Zhe still didn't speak. He gestured for her to be quiet again, then pointed with his finger toward the frosted glass door in the distance.
Su Yu followed his finger. Through the steam, she could vaguely make out a figure outside, leaning motionless against the wall by the bathroom door, eavesdropping, only half of their body visible.
The figure cast a blurry silhouette under the light.
Seeing this, Su Yu's heart skipped a beat. She lowered her voice as much as possible and guessed in confusion:
"Mom?"
Lin Zhe shook his head.
Instead, he stared intently at the silhouette, especially at the chest area...
That curve was exaggeratedly full.
Having made his judgment, Lin Zhe leaned close to Su Yu's ear and whispered so only the two of them could hear:
"Mom... isn't that big."
"..."
Su Yu gave him an exasperated look, thinking to herself: *You sure know a lot!*
But she instantly understood.
If it wasn't Mom, it could only be the other woman in this house.
Sister, Lin Yue.
Su Yu rested her head on Lin Zhe's chest, suppressing a smile, and whispered back in his ear:
"Sis really is... as you said, insatiable."
Hearing this, Lin Zhe could only smile wryly.
Although it had been a few days since he'd "favored" his sister, and he knew her sex drive was high, he never expected her to be so desperate that she'd blatantly come to eavesdrop outside the bathroom.
Su Yu looked up, her big, sparkling eyes asking her husband:
*What do we do?*
Lin Zhe looked again at the blurry figure by the door. An extremely bold idea rapidly took shape in his mind.
Since everyone in this relationship would eventually figure it out, why not just be straightforward? Why not pierce this layer of window paper completely, tonight?
After all, the house was only so big. An affair would inevitably be discovered one day.
They couldn't possibly go through the hassle of sneaking out to a hotel room every time they wanted to do it.
Leaving aside whether hotel rooms were hygienic, if they were secretly filmed, that would be a trouble among troubles.
He didn't want to be asked by someone he knew one day:
*Hey, is this you and your sister? Holy shit! Damn! You're really an animal, fucking your own biological sister...*
...
Thinking of this, Lin Zhe hardened his heart. He leaned close to Su Yu's ear and quickly proposed his idea.
After listening, Su Yu's beautiful eyes widened in astonishment, a trace of doubt mixed with disbelief:
"You... are you really sure about this?"
Lin Zhe nodded heavily, his face wearing an air of masculine bravado.
Su Yu only remained silent for three seconds.
Three seconds later, an excited, mischievous smile immediately bloomed on her face.
She first nodded, indicating her agreement with her husband's proposal.
Then, standing on tiptoe, she also whispered her own condition in Lin Zhe's ear:
"Then later... you have to fuck me more than you fuck sister."
Hearing his wife's condition, which seemed jealous on the surface but was actually a request for reward, Lin Zhe felt greatly reassured. He then made a serious "OK" gesture.
"Pfft."
Su Yu was amused by him and slapped away his raised hand.
"Then... should I go open the door?" Lin Zhe suggested next.
But Su Yu stopped him:
"Wait, let me do it. I'm afraid... sister might get scared off by you."
As she spoke, her gaze intentionally or unintentionally glanced at the enormous dragon below Lin Zhe's waist, which, despite having ejaculated, was still impressively sized.
And Lin Zhe knew Su Yu didn't just mean *that* when she said "scared off."
If he, the adulterous brother, went to open the door naked, sister Lin Yue's first reaction, out of shame and shock, would definitely be to run away.
But if her sister-in-law opened the door, the nature of it would change completely.
It would represent a tacit approval and invitation between women, equivalent to directly laying the cards on the table for Lin Yue:
*We know. And we don't mind.*
Thinking this, Lin Zhe couldn't help but give his wife a big mental thumbs-up for her intelligence and decisiveness.
Lin Zhe wanted to praise her a couple more times, but Su Yu had already sprung into action.
Taking a deep breath, her D-cups rising and falling with it, Su Yu, completely naked, still covered in foam and her husband's bodily fluids, calmly strode over to the door.
Her two snow-white, slender arms simultaneously grasped the door handle.
*Click.*
The lock was turned.
Su Yu pulled the bathroom door open with a yank.
"Sis, do you want to shower too?"
-------------
The night was deep. Outside the bathroom in the apartment building, the corridor light was dim.
Leaning against the cool door panel, Lin Yue's body was burning hot.
Under her loose, pink fleece loungewear, a fine layer of sweat had already broken out on her skin.
The sound of running water from inside the bathroom, mixed with the intimate laughter and conversation of her brother Lin Zhe and sister-in-law Su Yu, seeped through the door crack into her ears.
"Then... does it feel better with me, or with your sister?"
"Uh... it's better with sis... she... hers are bigger... softer..."
When she heard Su Yu's coquettish question, even egging Lin Zhe on to compare her body to her own, Lin Yue felt her legs go weak, almost unable to stand.
An uncontrollable current of mingled shame and excitement surged through her limbs, finally gathering below her abdomen.
Deep within her smooth, hairless mound, her honeyed gland let out a soft "gurgle," releasing a copious flow of slick fluid.
Lin Yue couldn't help but clench her thighs tightly, her plump buttocks tensing.
As if guided by some ghostly impulse, her right hand slipped once more into her loose sleep pants, delving into the cotton panties already soaked through.
Her fingertip deftly navigated the slick folds, accurately finding the pearl-like bud already standing erect.
Leaning back against the door, she tilted her head back slightly, closed her eyes, and began to quickly pleasure herself.
"Mmm..."
A thread of fragmented, soft moans escaped her throat.
Just as Lin Yue, her face flushed crimson, was about to be carried to the peak by this wave of self-gratifying pleasure, the sounds from inside the bathroom suddenly changed.
The sound of running water ceased for a moment, replaced by a series of hurried, ambiguous "gulping" swallowing sounds and Lin Zhe's barely suppressed groans.
Lin Yue's movements froze.
Even with her limited experience, she could tell Su Yu was using her mouth...
This realization sent her sense of shame to its peak, but what followed was an even deeper sense of defeat and jealousy.
She remembered this afternoon, on the sofa, how she herself had used her clumsy technique to try and please her brother, even needing him to instruct her in turn.
But now, with Su Yu, this sister-in-law, it took less than a few minutes for Lin Zhe to surrender.
The gap between them was indeed too vast.
Lin Yue should have left then. Behind this door was her brother and sister-in-law's private space.
But a thought suddenly surfaced.
She wanted to listen some more.
To hear if they would talk about... techniques... afterwards?
To hear how Su Yu managed to make a man so enthralled?
So, Lin Yue held her breath, pressing her ear even closer, trying to catch any valuable fragments from amidst the sounds of water.
She was completely unaware that it was this voyeuristic thought that would completely expose her.
The two inside the bathroom had long since reached a new consensus in this game of desire.
"Click."
The sound of the lock turning was faint, but it exploded in Lin Yue's ears like a thunderclap.
She snapped back to reality, wanting to pull back the hand still inside her panties, but it was already too late.
The bathroom door was pulled open with a "whoosh."
Blinding white light and steam laced with the scent of shower gel rushed towards her face.
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