Passion in the laboratory

As my university years were drawing to a close, I had a story I had to tell.
My major involved experiments very early on, so our experimental skills were generally stronger than those of graduate students from other majors. Near graduation, I worked on my dissertation under a PhD student. My dissertation was just a small chapter in one of his unpublished papers, but my enthusiasm for experiments remained high.
I don't know how much you guys know about this, but I'll explain. I was doing experiments in microbiology, specifically the cultivation and screening of microorganisms, usually sampling every two hours to test various characteristics.
At that time, a group of first-year graduate students joined our lab, many of whom were from other majors. In the second semester, they didn't have many classes, so the professor assigned them small projects, mentored by upperclassmen. My mentor mentored a senior student named Ziru. She was from another major and her experimental skills were much weaker than mine, so she often asked me questions, and we quickly became close. There were even rumors that we were dating.

Ziru is from Hebei Province. She's about 168cm tall and always dressed in sportswear. Her skin is radiant and healthy, and she always maintains a good mood, giving off a sunny, athletic, and capable vibe. Her personality is also cheerful and lively. If it weren't for her beautiful face and curvaceous figure, you'd definitely mistake her for a man. I easily forgot about her figure; I never even thought about her measurements or bust size.
Girls with this kind of personality easily get along with men, especially talkative ones. And I happen to be that kind of man. So we got along very well. We often went out for late-night snacks after experiments and then chatted in a spot on campus known as "Lovers' Slope." There were probably no more than five couples there. Since we were often there, rumors of us dating inevitably spread, which we both just laughed off.

My feelings for her changed due to an accident.
I'm very popular with the opposite sex, and I enjoyed chatting with them, but I didn't intend to take it any further. So, I made many female friends in college, the kind I chatted about anything and everything. And she hardly ever had a girlfriend.
When chatting with Sister Ziru, we always talked about our childhood. It felt like she was a close friend I'd known for a long time, and she poured out all her joys and sorrows. She would even choke up a little when she got emotional, so she often comforted me like an older sister, which I really appreciated; that kind of emotional solace was very comforting. Talking about these topics often led her to gradually open up and share her sad and happy memories.
Once, on the Lovers' Slope at school, we sat quietly on the grass under the moonlight, chatting softly. I watched her quietly and listened. She talked about her parents' divorce, her poor family background, her own efforts, the repeated failures and setbacks, and her first boyfriend. She said her boyfriend was the kind of guy who was charming but lacked ambition. Due to his lack of prospects and her father's opposition, they eventually broke up, but she still told me she still loved him. As she talked, she thought of all the hardships of the past, and gradually she leaned on my shoulder and sobbed. I gently patted her back and softly comforted her.
It was already past 1 a.m., and we had indeed talked for a long time. There weren't many people left on Lovers' Slope. I held her close, comforting her, letting her tears soak my shirt. We were so close, and I could smell her faint, sweet fragrance—it must be a woman's natural scent. I realized that even the usually strong and lively Ziru had a womanly side. As she sobbed, I felt her soft breasts rubbing against my skin, which actually aroused me a little. But my relationship with Ziru had always been pure, and this sudden impulse made me feel a pang of guilt. It was fleeting.
With my comforting words, Ziru gradually calmed down. I held her strong shoulders, straightened her body, and teased, "Sister Ziru, you're acting like a girl today, haha! A girl like this will find a good boyfriend."
She suddenly became shy like a girl, which delighted me. Seeing Sister Ziru so different in the dim moonlight truly amazed me.
"Xiaojun, you can't tell anyone about what happened today!"
"Of course, otherwise Sister Ziru's reputation will be ruined! Haha!" I laughed, while also concealing my unusual demeanor.
"I only talk about these things when I'm with you, Xiaojun. It feels so much better to talk about them!"
"Then you have to treat me to dinner, sister. You really look different today, you're so beautiful now! Haha!" I was back to my usual teasing and joking self.
"Alright, you little brat, you dare make fun of me? Here I come, take this!" Sister Ziru's strength was no joke; it hurt, but there was nothing I could do, I was used to being beaten. I've applied to remove this "little brat" so many times, but it's always been rejected. Just because I'm a year younger than her. "Alright, alright, it's getting late, sister, get some rest, we have experiments tomorrow!" I quickly stood up and fled the scene.
"I'll let you off the hook, I'll treat you to barbecue tomorrow, Xiao Jun! Goodnight, I'm going back to sleep." She gave me a sweet smile, so womanly!
This incident brought us closer, and my feelings underwent a significant change! I kept looking for opportunities to get closer to Sister Ziru.

Opportunity always favors the prepared!
Of course, that wasn't my deliberate arrangement, just an accident, but it created a beautiful memory for me!
That time, my senior arranged for a bacterial culture, requiring sampling every two hours for a week, and asked me to choose whether to sample at night or during the day. Considering how good my senior was to me, I didn't want him to be too tired, so I chose to sample at night. My senior was really kind, letting me sample from 10 PM to 6 AM every night, and he would take one more sample. But it didn't really matter, I went before 8 AM every day. On the third night, I arrived at the lab around 9 PM. I opened the door, and there was no one there.
As usual, I turned on my computer and connected to the broadband. The lab's nightlife was pretty good; I could surf the internet and watch movies. I could also browse porn sites, though back then websites weren't as good as they are now, and movies were hard to download. The porn on my own hard drive was copied from CDs. Sometimes I'd watch it at night and play games with my hands! Sometimes I'd watch the original soundtrack movies (not porn) downloaded by my seniors.
Around 11 PM, prime time, I opened my folder, unchecked hidden files, and wanted to check out my hidden porn for a bit. Suddenly, I heard footsteps in the hallway. I quickly closed the folder, and then heard the door open.
"Huh? The door's unlocked?" a familiar voice said!
"Who is it?" I called out!
"Ah? Someone's here? You scared me! Xiaojun? Is that you?" Sister Ziru opened the door and saw it was me.
"Yeah, it's one sample every two hours. I've been working night shifts for days!"
"Oh, I was wondering why I hadn't seen you for days! I'm doing it today too, one sample every four hours! One at 1 o'clock. I came early to surf the internet." Back then, there was no internet in the dorms, and even if there were, it wouldn't have mattered; Sister Ziru didn't have a computer.
"Oh, you go ahead, I'll go to the culture room to collect samples later." I stood up.
"By the way, Senior Brother Wang has some original-language movies on his disc, you can take a look. Don't you like watching original-language movies? There are no subtitles, I can't understand them."
A while later, it was midnight, and I went into the inner culture room to collect samples. About ten minutes later, I came out and heard groaning sounds as I walked to the door; it must have come from the computer.
I quietly walked up behind Ziru and saw two couples on the screen, engaged in frenzied intercourse, dressed in Western court attire. A man's enormous penis was thrusting in and out of the two women's mouths and vaginas, their lewd moans echoing in the small laboratory. The title, "Cleopatra," was in hidden format. So, Senior Brother Wang has a taste for this too, managing to get his hands on such a good film and give it such a fitting title!
Ziru, unaware of my presence behind her, stared intently at the screen, breathing rapidly, her small hands groping her body, finally stopping at her crotch, caressing it through her sweatpants. She glanced at the time and suddenly turned off the video. Turning around and seeing me standing behind her, she was completely flustered! Her face flushed, she stared at me blankly, her eyes more revealing than usual.
"I just saw this and thought it was a Western romance film. Who knew it was this? This Senior Brother Wang, really!"
"I didn't see clearly, what is it? Let me see!" I feigned ignorance.
"Don't look, it's awful!" She actually believed I hadn't seen it, and calmed down considerably.
"What is it?"
"It's a pornographic film from Europe and America! It's not good, you can't watch it, little one!" She seemed to have recovered a bit.
I wanted to warm her up quickly, especially since she called me "little one" again.
I double-clicked to open it.
"What are you doing?" Her face turned red, and she tried to close it! I held her small hand. Looking at the screen, the scene from before slowly reappeared.
"Sis, is this a pornographic film?" I asked in her ear.
"Yes," she struggled to pull her small hand away. But her eyes were still fixed on the computer. Seeing the big penis going in and out of her small mouth, her breathing became rapid, and my other hand involuntarily wrapped around her waist, touching her firm lower abdomen.
She twisted her body a few times, as if struggling but also teasing me. My left hand slowly reached into her loose sportswear and directly caressed her flat abdomen. At the same time, I stuck out my bright red tongue and licked her earlobe. She trembled all over, as if she had suddenly gone limp.
"No, Xiaojun! I consider you my good brother!" she said, maintaining a sliver of reason.
"Sister, I love you so much. You have to take responsibility today. How could I resist after watching a movie like this? Sister, I love you!"
"Xiaojun!! I!" Amidst the lewd moans playing on the computer screen, she was already lying motionless on the back of the chair. I held her tightly, my hands caressing her lower abdomen, slowly moving upwards until they touched the hard underwire of her bra. I traced circles on her nipples through the bra. My tongue had already slipped into her ear, occasionally sucking on her earlobe. I felt her smooth back pressed against my chest, her firm breasts bouncing in my hands. I was hard, my erection pressing firmly against her lower back because the chair had no partition. She seemed to sense my hardness, turning around and squinting at me.
"Xiaojun, you're so hard, you're so exciting! I'm so excited too!" She hugged me tightly, her little mouth pressed against mine. Without hesitation, I sealed her lips with mine, sucking hard, her little tongue being dragged into my mouth by my powerful suction. I gently bit her, sucking, her sweet little tongue swirling wildly in my mouth.
The stimulation from the Western porn and my series of actions made Ziru abandon her remaining rationality and let me do whatever I wanted. I picked her up and placed her on the clean lab table, unzipped her sportswear, and a pink bra appeared before my eyes!
"Sister, you're so womanly!" I gently peeled off her coat, revealing her bra completely. Ziru's perfect breasts, which she had never shown before, were now before me, huge breasts that I definitely couldn't grasp with both hands, firm and solid. I buried my head in her deep cleavage, moving my head from side to side, rubbing her cleavage. My hands also reached under her sports pants from behind, kneading her buttocks through her underwear.
Ziru cooperated by squeezing her breasts forward, their shape constantly changing under the pressure of my face.
My hands, which had been pulled from her buttocks, swiftly unhooked her bra. I grabbed her two high, ample breasts and sucked on them frantically. The lewd atmosphere emanating from the computer screen constantly stimulated Ziru and me. As I sucked, Ziru arched her legs, clamping them tightly around my waist and shaking her upper body. With her hands braced against the table behind her, I lifted her buttocks, suspending her entire body except for her hands, and quickly pulled down her sweatpants and underwear. Her long, slender legs were completely free of any flesh, and her slightly raised mounds were hairless—my Ziru was a bald woman. Glistening love juice had already smeared a considerable amount of her inner thighs with her movements.
"Sister, you're soaking wet!"
"Yeah, Xiaojun, I always pretend so hard because I'm afraid people will bully me, but you still bullied me today."
"No way! I love you, sister. I really like it. I know you like being a woman, and today I want you to be a real woman." I kissed her little mouth affectionately and continued to work hard on her breasts with my tongue.
"Mmm, I want it so badly! I like Xiaojun too!" Holding my head down, Sister Ziru moaned ecstatically, and the lewd sounds from the computer filled the entire laboratory with a decadent atmosphere. This made me even more crazy.
My right hand rubbed her little mound, and my left hand slapped her firm buttocks.
The computer changed the scene and played melodious music. I slowly parted Sister Ziru's labia majora and gently pinched her clitoris. Sister Ziru kissed my forehead frantically, and her legs clamped together.
"Sister, spread your legs! I'll make you feel good!" I begged!
"Hmm, little brother, it's been a long, long time since I've done this. Be gentle!" I felt a little disappointed after hearing that, but I quickly became excited again. It wasn't my first time, so why beg? This only made me bolder.
I squatted down, watching the tender flesh inside her vagina gently wriggle. I stuck out the tip of my tongue and touched the little bud, then licked the two labia. Then I tried to stick my tongue as far into her vagina as possible, moving it in and out repeatedly. I looked up to see her expression, but all I saw were two mounds of flesh swaying. My hands reached behind her, wanting to hug her buttocks and go in even deeper. My hands accidentally touched the test tube rack on the table. I immediately took a large test tube from it, rubbed it around her vagina, and after it was covered in her love juice, I gently turned the test tube upside down and inserted it into her vagina.
"So cool, so thick, Xiao Jun, what is this?" Sister Ziru enjoyed it for a long time, then opened her eyes, which had been closed for a long time, and looked at her lower body.
"Ah, a test tube, so thick?"
"Yeah, sister's pussy is so amazing, it's all the way in. It'll be over soon, sister!" After saying that, I started sucking on sister's clitoris again. My hand kept moving the test tube in and out. Soon, sister Ziru had her first orgasm!
"Ah... so good... Xiaojun... let me... so comfortable... the test tube is killing sister... ah..."
As sister continued to convulse, I increased the speed of my thrusting, bringing her to the highest point. She slowly went limp and lay on the table.
"Sister, I want some too." I sat next to her and kissed her.
She got to the floor, facing me. She was incredibly shy, licking her dry lips, her eyes staring straight at me.
"Good Xiaojun, what do you want?" she asked me coquettishly.
Sister Ziru standing up made my eyes light up. She was perfectly toned, athletic, with a firm, slightly upturned bottom, high, erect breasts, a flat stomach, a hairless mound of flesh, and a delicate face—she seemed flawless to me. I stared intently at her, my erection growing even stronger.
I glanced at my own groin, then at her beauty. "Sis, look how you've seduced me!"
"What? I seduced you?" She grabbed my lower body with one hand. "Who are you calling seducing whom?" She squeezed hard.
"I seduced myself, okay?" I begged for mercy!
"Hehe, Xiao Jun, will your sister serve you well?" She carefully unzipped my pants, afraid of pinching my penis. She took off my trousers and licked them a few times with her tender little tongue through my underwear, then pulled down my underwear. My
roaring penis bounced against her pretty face.
"Ah? So big," she murmured softly.
"What? Sister, what did you say?" "You bad guy, yours is so big."
"Am I not a little guy?"
"Ah...you've been waiting for me all this time?...You bad guy, you planned this all along..." She pretended to be angry. But her little hand started stroking my penis.
"No, I just like you, sister. Today was an accident. I really thank Senior Brother Wang, otherwise I don't know when I would have seen you like this. Sister, you are more beautiful as a woman!" I praised.
"Hmm...is that so? From now on...in front of you...I'll be...hmm...a woman, okay?" She had already put her little mouth on my penis, saying a word as she did so.
"Oh...so good...Sister...don't stop...yes...suck my penis...oh...yes...so comfortable," I moaned comfortably. I also pressed down on Sister Ziru's head, letting my penis go in and out of her mouth. She grabbed my penis with one hand, sucking and stroking it, while using the other hand to tease her own cunt. Watching Sister Ziru working tirelessly on my lower body, I was incredibly excited. The sluts on the computer had already reached multiple orgasms. In the lewd atmosphere, I jumped off the lab table, hugged Sister Ziru and kissed her passionately for a while, then made her put her hands on the lab table, stick her butt out, and turn her back to me. From behind, I inserted my penis into her hairless little cunt and started fucking her hard.
"Ah... Xiao Jun's... cock is finally inside, so comfortable... Ah... so good... Xiao Jun, fuck me... fuck... hard... fuck me hard... so good so good!"
Sister Ziru rubbed her buttocks in sync with my movements, moaning incessantly. Later, she started saying things that sounded like the sluts on the computer screen, even uttering a few English phrases.
Amidst the interplay of the computer screen's moans and Sister Ziru's moans, I thrust rapidly. Watching her labia constantly turning outwards, I was extremely excited, going all the way in each time, finally ejaculating my hot semen into her vagina during her next orgasm.
With each of my sweet words, Sister Ziru slowly calmed down. The last sample collection was still half an hour late. After collecting the sample, I held her and enjoyed watching "Cleopatra" until 2 AM when I went to collect another sample and continued watching. After calming down, my emotions were stirred again by the vivid details, and I couldn't help but caress, knead, and kiss it, finally fucking that beautiful, hairless little cunt hard one last time.
From then on, my last semester of senior year was no longer a blank.

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Passion in the laboratory

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