The Gorgeous Slutty Sister Mayuko Teaches Her Younger Brother What Real Pleasure Feels Like

Chapter 1 – Abnormal Reaction in the Middle of the Night

Mayuko turned the key in the lock at half past one in the morning.
She had just come back from a company drinking party. The click of her high heels echoed on the entryway floor; her hair still carried the faint scent of cigarettes and alcohol. The living room lights were off, but she could faintly hear suppressed breathing coming from her younger brother’s room.

She walked to the door. It wasn’t fully closed.
Inside, her brother was sitting with his back to her, one hand braced against the headboard, the other rapidly stroking his cock, which was flushed dark purple and rock-hard. The sheets were a mess. A few wet spots stained the pillow. He bit his lower lip, forehead covered in sweat, eyes half-closed, as if he was fighting something.

Mayuko didn’t speak right away.
She leaned against the doorframe and watched quietly for more than ten seconds. His movements grew more frantic, his breathing more chaotic. Finally he muttered a low “Fuck… still can’t come,” and collapsed onto the edge of the bed. His cock was still twitching lightly, but nothing came out.

She suddenly found it interesting.

“How long have you been holding it in this time?”

Her brother nearly fell off the bed in shock. He hurriedly grabbed the blanket to cover his lower half, his face flushing so hard it looked like it might bleed. “Sis… w-why aren’t you asleep yet?”

Mayuko walked in and closed the door behind her.
She didn’t turn on the light. Using only the faint moonlight coming through the window, she crouched in front of him. She yanked the blanket away in one motion, exposing the still-hard cock to the air. He tried to pull away, but she caught his wrist.

“Don’t hide. Let big sister take a look.”

Her fingertips were cool, yet she deliberately scraped the sensitive head with her nail. His whole body jerked, and a short, sharp inhale escaped him. Mayuko looked up at him, the corner of her mouth curling into a lazy smile. “Can’t come, right? Has it been like this every day lately?”

Her brother clenched his teeth and said nothing.
Mayuko already knew the answer. Lately she had often caught the faint smell of sex in his room, and she had seen the used tissues in the trash. She just hadn’t planned on doing anything about it.

Until tonight.

She suddenly leaned her face close, her breath washing directly over the scorching cock.
“Big sister will help you.”

Chapter 2 – The First Time with Her Mouth

Her brother thought she was just saying it.
Instead, Mayuko pressed her lips straight against him.

She didn’t rush to take him in. She only slowly licked over the entire head with the tip of her tongue, as if tasting something interesting. Saliva quickly made everything wet and shiny. Then she gave a slightly stronger suck, producing a soft, wet sound.

His fingers clenched the sheets so hard his knuckles went white.
“Sis… is this really okay…?”

“Shut up.” Mayuko looked up at him, her voice a little hoarse. “All you need to do right now is feel.”

She began to take him in properly.
Her mouth was hot, her tongue wrapping around him flexibly, sometimes deep, sometimes shallow. He had never been treated like this by anyone before. His entire body was on the verge of losing control almost instantly. Mayuko felt his thighs trembling and deliberately slowed down, lightly scraping the sensitive spots with her teeth before suddenly swallowing him all the way to the base.

“Nngh…” He finally couldn’t hold back a sound.

Mayuko pulled off him, a thin string of saliva still connecting her lips to his cock. She gripped him with her hand and slowly stroked up and down while rubbing the tip with her thumb. “You can come in big sister’s mouth. Or on my face, or on my chest. Whatever you want.”

He was panting so hard he could barely form complete sentences.
In the end he still came. The amount was large; most of it went into Mayuko’s mouth. She didn’t swallow right away. She opened her mouth so he could clearly see the white fluid, then slowly swallowed, her throat moving once.

“Tastes thicker than I expected,” she said, wiping the corner of her mouth, her tone like she was commenting on a dish.

Her brother collapsed onto the bed, his mind completely blank.
Mayuko, however, wasn’t ready to stop yet.

Chapter 3 – The Real Entry

Three days later.
Her brother thought that night had been a one-time accident. Instead, Mayuko walked straight into his room and locked the door behind her.

Today she was wearing loungewear with nothing underneath.
She walked to the bed, pushed him down, and straddled him. When their lower bodies pressed together, he clearly felt how wet she already was.

“This time we’re not using my mouth,” Mayuko said in a low voice, a hint of excitement in it. “We’re using this.”

She gripped his cock herself, lined it up, and slowly sank down.
The process of taking him inside was slower than expected. It was the first time he had ever been truly wrapped around, and the heat and tightness almost made him come on the spot. Mayuko bit her lower lip, her expression a mixture of discomfort and pleasure. Her hands braced on his chest as she slowly adjusted the angle.

“So tight…” she gasped with a small laugh. “This thing of yours is even more impressive than it looks.”

Once she was fully seated, she paused for a moment to let both of them adjust.
Then she started moving.

It wasn’t the gentle kind of movement.
Mayuko deliberately twisted her hips deep, rising each time until only the tip remained inside before slamming all the way back down. The wet sound of skin hitting skin was especially clear in the quiet room. Without realizing it, his hands grabbed her waist, fingertips sinking into the soft flesh.

Mayuko leaned down, her lips brushing his ear. “Do you like it? Being inside big sister?”

He couldn’t answer.
He could only nod hard.

She smiled and suddenly sped up.
Their breathing tangled together. The sheets were a complete mess. When Mayuko came, she bit down on his shoulder and let out a low, almost sobbing sound. He came inside her while she was still shaking, the amount so large it nearly overflowed.

Afterwards.
Mayuko didn’t leave right away. She stayed lying on top of him, her fingers idly tracing the sweat on his chest.

“From now on, whenever you want it, just come find big sister,” she said in a lazy voice. “Don’t keep holding it in by yourself. What a waste.”

He buried his face in her neck, his voice muffled. “…Got it.”

Mayuko gave a soft laugh.
She knew this was only the beginning.