Leo's high school grades were not outstanding, but they were good enough for him to get into a private vocational school near Chengdu.

Before the semester started, he decided that commuting every day would be too tiring, so he rented a room near the school, only going home on weekends and holidays to visit his mother.

He rented a room in a building specifically designed for student housing. The building was an illegally constructed addition on top of an old six-story apartment building, containing six rooms that shared a bathroom and a small kitchen. There was also a small rooftop terrace for drying clothes.

When Leo moved in, there were still five or six days left before the start of school, and he had no idea who his neighbors would be.

The landlord and his wife, surnamed Hu, lived on the sixth floor below. Both were in their early thirties and had been married for several years. They had two young children, ages four and five, who went to a daycare during the day while their parents worked, living a typical working-class life.

On the third day after Leo moved in, his room was mostly settled, and he decided to go out for a simple Chinese lunch. The old apartment building had no elevator, so he had to take the stairs. As he descended from the sixth to the fifth floor, he heard the landlord's door open, and the landlady was coming out.

"Mrs. Hu, not working today?" Leo casually asked. Mrs. Hu had prearranged vacation days, and she had to take them or lose them, so she had the day off.

In fact, she had slept in because she didn't have to work and had just gotten up, intending to go out for lunch as well. She happened to bump into Leo. "Yes, are you heading out, little brother?" She called him "little brother" since he was a student.

"I'm going out for lunch. How about you?" Leo asked. "Me too. There's a decent fast food place across the street. Do you want to go together?" Mrs. Hu was very friendly.

"Sure," Leo replied.

They went to the restaurant, ordered their lunches, and chatted while they ate, gradually becoming more familiar with each other. Mrs. Hu wasn't particularly beautiful but wasn't unattractive either, and she had an average figure, not the curvaceous type that Leo found most appealing.

Today, she was wearing a comfortable, relaxed knee-length dress that showed just the right amount of her fair legs. The tables at the fast-food restaurant were small, and they sat at a 90-degree angle to each other. At times, Mrs. Hu would cross her legs, causing Leo to sneak peeks at her.

She had a cute short haircut, and her makeup-free face looked sweet when she smiled. While eating and drinking, her lips and tongue moved gracefully, and Leo thought to himself, "She has her own charm as a simple beauty."

After lunch, the two walked back to the apartment building. As they reached the entrance, the mail carrier happened to be delivering a package for the Hu family. It wasn't a large package, but it was quite heavy. Mrs. Hu hurried upstairs to get a stamp, while Leo took the package and waited with the mail carrier downstairs.

After going up and down six flights of stairs, she was panting. After the mail carrier left, she caught her breath and laughed, saying, "Little brother, as you can see, I have no strength left. Could you help me carry this package upstairs?"

"of course, no problem with that." Leo said.

When they reached the fifth floor, Mrs. Hu jogged up to the sixth floor to open the door. As she went upstairs, Leo took the opportunity to glance up and saw that she was wearing a small white pair of underwear beneath her dress, which revealed more than half of her firm, well-shaped buttocks when she moved. Although they were not large, the sight was stimulating, and Leo's heart raced. When they reached the sixth floor, Leo placed the package in the living room, and Mrs. Hu thanked him repeatedly.

Just as Leo was about to make small talk, Mrs. Hu asked, "Little brother, do you have any plans for the afternoon?" Leo thought for a moment and said, "School hasn't started yet, so I don't have anything to do." "Well, since I'm home all day, I thought I'd tidy up the house and do some cleaning. Some of the furniture is too heavy for me to move on my own, so I was wondering if you could help me. I'll treat you to dinner tonight as a thank-you." Leo had a good impression of the kind landlady, and since he had nothing better to do, he agreed.

The two of them worked together to tidy up the place, and it was no easy task. The weather was hot, and after two or three hours, they were both drenched in sweat. Despite having air conditioning, Leo couldn't help but take off his shirt.

Finally, the cleaning was more or less done, and it was already past 3:30 p.m. Mrs. Hu took two bottles of cola from the fridge, and they sat in the living room, laughing and drinking together.

"Thank you, little brother. I'll treat you to a steak dinner later," Mrs. Hu said.

"Sounds great, but what about your husband?" Leo asked. "He's working overtime today and won't be back until after 8 p.m. when he picks up the kids." Suddenly, Mrs. Hu remembered something. "Oh, I haven't used the electric stove on top of the kitchen cabinet for a long time. Could you help me get it down?"

Leo went to the kitchen, set up the stepladder, and started searching through the cabinet. "Mrs. Hu, I don't see the electric stove, and this cabinet is really cluttered," he said. "You come down and hold the ladder for me. I'll have a look. Maybe I put it somewhere else and forgot."

As she spoke, she climbed the stepladder, and Leo looked up, catching another glimpse of the view under her skirt. This time, he saw it even more clearly and closely.

He said, "You always call me 'little brother,' so I naturally have to call you 'older sister,' right?"

Mrs. Hu playfully turned her head and said, "Hmph, you bad boy."

Leo became even happier and whispered in her ear, "I don't just want to be your little brother, I want you to call me 'big brother.'"

Mrs. Hu blushed red with embarrassment and spat, "Who do you think you are to ask me to call you 'big brother'?"

Leo let go of Mrs. Hu, straightened up, quickly untied his pants, and pulled out a long and thick "big brother" that stood straight in front of Mrs. Hu's face, less than a centimeter away from her nose.

He said, "This is who I am."

Mrs. Hu was stunned by the sight of it. Oh my god, it's so big! It really left her speechless. To make matters worse, the masculine scent emanating from it made her feel dizzy. As if she had been put under a spell, she stared blankly at it and involuntarily whispered, "Big brother."

Leo had only wanted to tease her, but he didn't expect her to be frightened by the sight of his "big brother."

He pressed his hands against her cheeks and said, "You're my big sister now."

Mrs. Hu obediently opened her cherry lips, sucking, licking, and kissing his "big brother," showing it all sorts of affection.

She knew that soon his "big brother" would enter her "little sister," and uncontrollably, her juices began to flow.

While Mrs. Hu was occupied with Leo's "big brother," he lifted her shirt and took it off, revealing her entire figure.

First, there was the smooth and graceful curve from her shoulder blades to her butt. Her small triangle-shaped panties accentuated the roundness of her buttocks, and her breasts of just the right size were white and milky, shapely and perky, barely contained under a half-cup bra.

Leo undid her bra hooks and removed the bra, revealing everything. Her small nipples were proudly erect, colored slightly darker due to breastfeeding. Leo stretched out his hands and cupped her full breasts, feeling the softness, and gently rubbed her nipples with his palm.

Mrs. Hu panted and moaned "Ah, ah" with his big brother still in her mouth.

Leo pushed Mrs. Hu onto the couch, so she was leaned back against the backrest. He removed her underwear as well as his own and knelt in front of her with his "big brother" standing up, ready to penetrate.

When his "big brother" touched her opening, he didn't stop to take a breath, and immediately plunged in all the way to her womb. She had never been penetrated so deeply before and almost couldn't breathe.

When he slowly pulled out, she let out an "Ah, ah" sound, climaxing.

"You're so beautiful, big sister," Leo said.

"Yes, I'm climaxing, big brother," Mrs. Hu said.

"It's wonderful. I'll come to the end, big sister."

"Ah, I'm climaxing again, big brother. I'm dying."

She called out louder and louder, and her body trembled with each climax. Leo couldn't resist kissing her lips, tongue, and ears.

Mrs. Hu couldn't handle it any longer and screamed, "Oh, oh!" as her body shook with another wave of climax.

"You want me to stop, big sister?" Leo asked.

"No, keep going, big brother," she gasped between breaths.

Leo flipped Mrs. Hu over, so that she was on all fours on the sofa, and gave her two large cushions to hug so that she was more comfortable.

His "big brother" penetrated her from behind, this posture deeper than ever before. Mrs. Hu let out a soft moan from her throat, turned her head halfway to look at Leo, and smiled seductively, her face full of lust.

Leo couldn't help but thrust harder, his big member going in and out. When he pulled it out, it was covered in her juices. As he went in again, he reached all the way to the bottom and rubbed against her flower heart. Mrs. Hu had never felt so good, arching her back to give Leo more comfort.

"Oh my god, this feels so good. I'm going to climax again. I might die today," she moaned, unable to control her pleasure.

Leo didn't pay attention to her, too focused on his own pleasure. He held her beauty with both hands, admiring how his big member went in and out of her small opening. Suddenly, a pleasant numbness hit his head, and he exclaimed, "Good sister, obedient sister, I'm about to come."

Mrs. Hu was taken aback and begged him to stop, telling him to take it out. But Leo couldn't stop, in the throes of passion, and as his climax approached, he groaned and came inside of her.

Mrs. Hu felt him grow even stronger and bigger, and she squeezed around him, leading to their simultaneous release. "Ah, sister, so beautiful, so wonderful," Leo said, as they both reached their climax.

Leo collapsed on top of Mrs. Hu and held her tenderly, and they shared a sweet kiss. Both closed their eyes and rested for a while, enjoying the aftermath of pleasure.

Afterward, both were covered in sweat, and Leo said goodbye to Mrs. Hu and went back to clean up on the rooftop. Mrs. Hu went to her bathroom and washed away all of the sweat, water, and love. She didn't want her husband to know about her affair. Though she and her husband had a good sex life, it wasn't as passionate or as satisfying as what she had just experienced with Leo. It felt like she was young and in love again.

Around 6 p.m., they both showered and put on clean clothes. Mrs. Hu promised to take Leo out for steak, so they went to a quiet little steakhouse and enjoyed a romantic dinner, complete with sweet nothings whispered back and forth.

Returning to the apartment, Leo was worried that the landlord might come back, so he went straight to his room to sleep. The next morning at around 7:40, Leo was about to go downstairs to buy breakfast when the landlord's wife came to say goodbye to her husband and child who were leaving.

They exchanged greetings and Leo went downstairs with Mr. Hu. When they reached the 5th floor, Leo pretended to have forgotten something and went back upstairs. Mr. Hu continued downstairs with his child, not suspecting anything. Leo returned to the 6th floor and found that Mrs. Hu hadn't locked the door yet. They made funny faces at each other and entered the apartment, locking the door behind them. They immediately embraced each other tightly and kissed passionately.

Because Mrs. Hu had just gotten out of bed, she was wearing only a loose nightgown. Leo easily slipped his hand inside and fondled her breasts. "By the way," Mrs. Hu suddenly remembered, "I have to go to the window to wave goodbye to them."

"Oh, how sweet," Leo said sourly.

"Hey, he's my husband, why are you jealous?" Mrs. Hu playfully tapped his forehead and scolded him with a laugh. Mrs. Hu went into the bedroom and Leo followed. She crawled to the window and opened it, leaning out slightly. Her husband and child had just left the apartment and were waving back at her.

She waved back, while Leo lifted her shirt to reveal her perky nipples, and he realized she wasn't wearing a bra. "Wow, having sex with your husband in the morning is nice," Leo said as he teased her breasts, which were already erect.

"What's wrong with having sex with my husband?" Mrs. Hu replied, still waving at them without turning around.

Suddenly, she felt a warm touch and then the pressure of Leo's penis thrusting into her vagina. She almost choked on his penis but couldn't make any suggestive expressions because her husband and child were still outside. Finally, they went down to the first floor and Mrs. Hu thought she could relax, turn around and scold Leo, but her husband got out of the car and made a gesture indicating the car had a problem. He opened the hood and leaned over to check.

Mrs. Hu had to continue leaning on the window sill, enduring Leo's slow strokes, while her husband and child were still outside. Finally, her husband made a thumbs up gesture, closed the hood, got back in the driver's seat and was ready to start the engine.

Mrs. Hu couldn't take it anymore, and with a moan, she threw her head back and reached orgasm. Leo released her breasts and allowed her to turn around and climb into bed with him. They quickly removed each other's clothes and engaged in sexual intercourse. Mrs. Hu was not wearing any underwear underneath her dress.

"Ah, bad boy, you're so good this early in the morning," Mrs. Hu moaned, as Leo stroked her nether regions.

"Am I better than your husband?" Leo asked.

"You're the best, big brother. You make me feel so good," Mrs. Hu replied with a lascivious expression. She climaxed several times while Leo penetrated her. He knew that she still had to go to work, and they couldn't continue for too long. He quickly reached orgasm with her, and they held each other tightly, breathing heavily.

"Am I really better than your husband," Leo asked again.

Mrs. Hu laughed and glared at him, refusing to answer. Leo tenderly caressed her body while she almost refused to get up. Finally, she had to get up and dress herself, preparing to go to work. They both agreed to meet again soon.