The walls were thinner than expected.
That was the first thing Rika noticed when she and her husband Daichi finally moved into their new apartment in Tokyo's outskirts. It wasn't much—just a two-room setup with an old AC, a creaky floor, and a cheap rent. But it was theirs. After all, they were newlyweds. Twenty years old, full of dreams, and full of each other.
That night, as the sun dipped beyond the dirty blinds, Rika stepped out of the bathroom wearing nothing but a short silk robe—clinging to her like second skin. She was barely 5'3", but what she lacked in height, her body made up for in pure, sinful curves. Her thick G-cup breasts pushed against the fabric, jiggling with every sway of her hips. Her round hips and wide thighs gave her a body that turned heads twice, like a lewd milf trapped in a 20-year-old's body.
Her wet hair clung to her flushed cheeks. "Mmm, Daichi~ Come to bed already."
Daichi smiled, pulling his shirt off. He wasn't the biggest guy—lean, average height, modest cock—but Rika loved him. Or at least, she told herself that. As he climbed into bed, their lips met, warm and sticky. Passion burst like wildfire between them. Rika moaned into his mouth as his fingers slipped beneath her robe.
They didn't even bother turning off the light.
Right next door, Kaito sipped his beer.
At 40, Kaito lived alone. His wife had left him years ago. No kids. Just long days at work and longer nights of silence. He barely noticed his new neighbors earlier that day—only hearing muffled hellos, boxes sliding across floors.
But tonight, it was different.
He was sitting in his worn-down chair, watching TV, when he heard it. A soft moan—delicate and feminine. His ears perked up. He muted the TV.
"Ahh… Daichi… deeper~"
His cock twitched in his pants.
He stood slowly, following the sound toward the shared bedroom wall. He touched it. Hollow. The drywall wasn't thick at all. The bed must've been right against it.
A low smack-smack-smack began to echo. Skin on skin. Wet, fast, rhythmic.
Kaito's breathing slowed. He leaned in, listening closer. Then he noticed something—an old air vent cover screwed into the wall near the floor, just above a faded tatami mat.
It didn't look like much. But curiosity got the better of him.
He bent down and unscrewed the rusted cover. A thin, square hole greeted him—about the size of a palm, leading directly into the next room. Covered only by darkness.
He peeked in.
And there she was.
Rika. Naked. On all fours.
Her ass was facing the wall, bouncing rhythmically with each thrust her husband gave her. Her thick cheeks rippled, slick and red, with her pussy glistening under the dim yellow lamp above. Her tits swung beneath her like heavy milk balloons, brushing the sheets every time she rocked forward.
Kaito's cock surged to life in his pants—already leaking precum as he gripped it.
She moaned loudly. "Fuuuck~ D-Don't stop, babe!"
Kaito couldn't take his eyes off her. The way her ass clapped with every thrust. The way her folds spread open to take every inch of her husband's average cock. And the look on her face—eyes rolled up, tongue lolling out, pure ecstasy.
He dropped his shorts.
His cock slapped against his stomach.
Thick. Veiny. Uncut. 9 inches of neglected, pulsating flesh. He gripped it hard, jerking slowly as Rika let out another slutty moan and buried her face into the pillow.
Her body was unreal.
This wasn't porn. This wasn't fake.
This was real. Right in front of him. Just inches away.
His hand moved faster. The base of his shaft throbbed with every jerk. He imagined her mouth wrapped around it—those plump pink lips, those soft cheeks hollowing as she sucked.
She turned her head suddenly—her cheek pressed against the pillow—and for just one second, her eyes opened.
They looked right at the hole.
Right at him.
He froze.
But she didn't stop.
Rika's eyes widened slightly. Her mouth parted in shock. Her brows furrowed… but not in fear. Not in disgust.
In curiosity.
For a split second, she was too stunned to react. But then her eyes dropped—and saw it.
Kaito's cock. In full view. Thick. Hard. Veiny.
She watched it pulse. She watched the foreskin stretch back with every stroke. Watched it twitch, precum dripping from the tip like nectar.
Her pussy clenched.
And yet—she didn't tell her husband.
She just closed her eyes again… and bit her lip.
Kaito came.
"Fuck—!" he whispered hoarsely as ropes of thick cum splattered against his chest and the floor. Hot jets fired from his cock, timed perfectly with Rika's muffled moans as she climaxed, grinding her ass back into her husband's cock.
He barely held himself up, panting against the wall.
The hole stayed silent.
---
The next morning, Rika sat at the table with a blank look on her face. She sipped her tea slowly as Daichi chatted about some grocery shopping.
"Did you sleep well?" he asked.
She smiled. "Mmhm. Slept like a baby."
But her legs pressed together beneath the table.
Because she couldn't stop thinking about the man on the other side of that wall.
That massive cock she saw.
That thick cum she imagined spraying across her face.
That hole… calling to her.
Tonight, she'd lean just a little closer.
Maybe… open her mouth.