Sister Yun, my dear sister

Spring comes and goes, year after year. My job has changed; I'm responsible for more departments, and my office has moved back to the office building. Sister Yun works on the third floor, and I work on the second. The offices on the third floor are all small rooms, and Sister Yun, as the department head, has her own room. I often go to her office to chat, taking the opportunity to flirt with her and touch her. Sister Yun always seems nervous and scared.
In our state-owned enterprise, everyone has a habit of playing cards during lunch break. Most colleagues gather together to play cards after lunch, but Sister Yun doesn't like playing cards. Every day at noon, she either watches the computer for a while after lunch or sleeps on the sofa.
After figuring out Sister Yun's routine and the routines of the departments on the third floor, I had a bold idea: to sneak into Sister Yun's office during lunch break when everyone was resting and playing cards.
That day, the hallway in the office building was very quiet at noon. I tiptoed up the stairs, listening intently to the sounds coming from the hallway. When I arrived, I observed that all the room doors were closed, and the sounds of people playing cards were coming from inside the rooms. I tiptoed past a few rooms and pushed open Sister Yun's office door. Sister Yun had just returned from washing the dishes and was drying her hands when she saw me come in. Surprised, she asked, "What are you doing here?" I quickly put a finger to my lips and whispered, "Keep your voice down." I then locked the door. Sister Yun whispered, "What are you doing? What if someone finds out?" I quickly said, "It's okay, I
'll just kiss you and then you can leave." Without further ado, I reached out and hugged Sister Yun. She said helplessly, "Just a touch is fine."
I lifted Sister Yun's clothes, pushing up her bra, revealing her large breasts. I began to suck and knead them, and then pulled her pants down to her calves, exposing her large buttocks.
While sucking on her breasts, I used my fingers to tease her vulva. Sister Yun wiggled her buttocks, softly saying, "Bad, little brother...you...are making...sister...feel...so...so...uncomfortable..."
I continued to suck on her breasts, my fingers tracing patterns on her labia and clitoris. Her vagina began to leak fluid, and her buttocks began to writhe violently. "No...no...I can't take it...anymore," she cried softly.
I helped her sit on the sofa, then turned around and took a cushion from the opposite sofa, placing it between her thighs.
I knelt on the cushion, lifting her thighs and spreading them apart. Her wet vulva was exposed before my eyes, her labia majora drooping. I gently sucked on them. She let out a soft "ah, oh."
My tongue gently licked the entrance of her vagina, occasionally lightly touching her clitoris, and sometimes sucking her labia into my mouth. She watched my every move, panting heavily.
As I continued to lick and suck, a large amount of vaginal fluid gushed out. I stopped licking and slowly inserted two fingers into her vagina. She opened her mouth and exhaled a large breath.
Two fingers, glistening with vaginal fluid, gently thrust in and out of my sister's vagina. Her eyes were half-closed, and she moaned softly. Her hands cupped her breasts, her thumbs slowly rubbing her nipples.
Seeing her so comfortable and enjoying herself, I gently increased the speed of my thrusts. The sound of my fingers moving in and out of her vagina was soft and gentle.
I rotated my fingers, my fingertips moving upwards to her G-spot. I began to gently rub it, and my sister's large buttocks began to writhe violently. I could feel a fleshy lump inside her vagina constantly pressing against my fingers.
I gradually increased the pressure of rubbing her G-spot, and suddenly, my sister opened her mouth wide and softly cried out, "No...no...I'm going to...come..." Looking at her, I knew she was about to climax.
I maintained the speed of my fingers thrusting and rubbing inside her vagina, and then brought my lips to her clitoris and began to lick it. Under the dual stimulation, my sister's body trembled slightly. Afraid of being overheard, she suppressed her moans, groaning softly. A moment later, her body tensed, her thighs clamping tightly around my head and fingers, refusing to move. Vaginal fluid gushed out, soaking my hand. She collapsed onto the sofa, panting heavily. Her
vaginal opening was open, the pink urethral opening protruding like a child's open mouth.
I had turned on video recording on my phone before entering the room and kept it in my work vest pocket.
Passion in an empty rented room is especially thrilling. I used the empty office room to meet my sister during her work hours, choosing a time and getting the key first. Then I called her from the room. At first, she was afraid to come. I told her it was okay, she usually wouldn't run into colleagues, and even if a colleague did, she could just say a friend wanted to rent the room to open a company and I was helping to check it out. After much persuasion, she finally agreed.
Sister Yun arrived nervously and tremblingly, asking me fearfully, "What if someone comes?" I said, "Don't worry, no one will come. The door is locked from the inside. No one can get in." Only then did Sister Yun relax.
We went to the innermost room, where I had prepared a sheet beforehand and laid it on the floor. When Sister Yun saw it, she laughed and said to me, "You bad boy, you've prepared everything, haven't you?"
Without saying a word, I pulled down Sister Yun's pants and started frantically groping and touching her. After a while, Sister Yun couldn't stand up anymore, so I told her to lie down and stick her buttocks out. I knelt beside her and continued to play with her buttocks and vagina. I would touch her vagina one moment and lick her clitoris the next. Sister Yun twisted her big buttocks, moaning "Ah...oh..." and occasionally asking me, "Is it fun, sister?" I would continue groping and touching her, answering, "Sister is fun, brother likes to play with sister. Sister, if you're enjoying it, just scream. No one can hear you here. Scream, sister, scream." "Ah...ah...oh," Sister's voice opened up.
After playing with her for a while longer, Sister Yun couldn't take it anymore and rolled over to lie down. I inserted two fingers of my right hand into Sister Yun's vagina and rubbed her G-spot. I gently rubbed her clitoris with the pad of my left thumb. "Ah...ah...ooh...oh..." Sister Yun started to howl loudly, "Ah...ah...you're...playing...to death...ah...Sister...is...going...ah...oh..."
Suddenly, Sister Yun sat up with her big eyes looking at me playing with her body, "Ah...you're...playing...to death...Sister...ah...oh...almost...going...to...come...ah...ah..."
My fingers increased the speed inside Sister Yun's vagina, and with a "ah..." she came...Sister Yun collapsed. A gush of vaginal fluid gushed out from her vagina, flowing all over my hand and wetting the sheets under Sister Yun's buttocks.
The most exciting time was when I was really sleepy one day, so I secretly went to the power distribution room to sleep. I told the person on duty to stay in the break room in front, and that I would go there and come back after I woke up. By sheer coincidence, just as I woke up, Sister Yun called my cell phone to discuss buying safety equipment. I told her to come to the power distribution room to find me. Sister Yun arrived shortly after. After she came in, I locked the door and took her hand to the bed where the duty officer was. Without saying a word, I started to take off her pants.
Sister Yun asked nervously, "Won't anyone come?" I said, "Don't worry, no one will come without my permission."
I pulled her pants down to her ankles and had her lie across the lower bunk with her feet braced against the metal frame of the upper bunk. Her big white buttocks were exposed, her vagina was open, and her purplish-red labia were drooping. This environment, this position, was too stimulating.
I couldn't help but stand in front of the bed and admire her. Sister Yun, seeing me admiring her body, said shyly, "You're so annoying."
I unzipped my pants and pulled out my already hard penis. Holding my sister's buttocks with both hands, I gently rubbed the head of my penis against her vaginal opening a few times, and my sister moaned.
I gently rubbed her vagina with my thumb, and slowly inserted my penis into her vagina. My sister's big buttocks began to wiggle, and she kept muttering softly, "Itchy...itchy..."
Slowly, I felt vaginal fluid secreting, which lubricated my penis considerably during penetration. I increased the speed of my thrusts, applying more pressure with my thumb, and my penis slid in and out of her vagina with a series of "plop, plop..." sounds.
Soon, my sister's thighs began to tremble, and her buttocks started to writhe violently. I knew she was close to orgasm. I quickly increased the force of my thrusts, and after another dozen or twenty thrusts, my sister let out a "whoosh" and orgasmed. At the same time, I also thrust hard a few more times and ejaculated, pulling out my penis. A stream of white semen flowed from my sister's vagina down her buttocks and onto the ground.
[The End]

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Sister Yun, my dear sister

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