My sister's physiology lesson

My name is Zhou Tianlei, I'm 15 years old, and I'm in the second year of junior high school. I have an older sister named Zhou Lingsi, who is three years older than me and is in the second year of senior high school. My sister is very beautiful; she has big eyes, a delicate and flawless oval face, and fair, jade-like skin. Combined with her clear and melodious voice and well-developed figure, she's a truly beautiful girl.

I'm completely clueless about matters between men and women, but my sister is very knowledgeable in this area. Once, I accidentally barged into her room, and she was watching porn while simultaneously touching her genitals with her fingers (I later learned this is called masturbation). When I entered, she was probably too engrossed to notice me. My cheeks flushed, and my heart raced; I don't know why. While eating, I secretly glanced at my sister, and she looked at me too. I wondered if she had seen me. "No, she definitely didn't see me," I told myself.

It was another uneventful afternoon after school. Yesterday's weather forecast said it would be cloudy turning to light rain today, but I didn't pay much attention and didn't bring an umbrella. Who knew it would start raining so suddenly, and it was getting heavier by the time school let out? What to do? I didn't have an umbrella. Oh no! I thought to myself, so what if I get soaked? Consider it a free shower. Okay, after three counts, I rushed home. 1, 2, 3, just as I was about to run, I heard a call behind me.

"Xiao Lei!"

I turned around and saw my sister and her classmate slowly walking towards me. I replied somewhat dejectedly, "Sis!"

"What, didn't bring an umbrella? Luckily, I did, let's go together!"

"Oh, okay."

Her classmate said regretfully, "Sisi, we were planning to watch DVDs at my house today, looks like we'll have to wait until next time."

"It's not like we've missed our chance, next time is fine too."

"Yeah, definitely come next time, okay? She's your type, I had a really hard time finding her!" My classmate said with a very ambiguous expression.

"Xiao Lei, let's go."

My sister likes things that are compact, including umbrellas, so her umbrella is only big enough for her; it would be too small for two people.

"Xiao Lei, the umbrella is a bit small, come closer."

My face flushed slightly, but I did as she said. As the rain intensified, my sister and I moved closer together. However, the rain was so heavy, and my sister's umbrella was too small, so most of us still got wet. Suddenly, my sister put her hand on my shoulder, in a very intimate way. My face turned even redder. Seeing my flushed face, my sister asked curiously, "Xiao Lei, what's wrong? Have you caught a cold?"

"Maybe! My face feels a little hot."

"Then we need to hurry home!"

My sister smelled wonderful. As we walked, my arm inevitably brushed against my sister's chest. Her breasts were very soft, and the light touch felt very comfortable. Because the umbrella was too small, I couldn't run. I originally wanted to run back by myself, but my sister said I might get a high fever. Actually, I felt I'd get a high fever whether I ran or not. My sister slowly, slowly, hugged me tighter and tighter, as if she were holding me in her arms. I felt cold, so I crossed my arms in front of my chest. As my sister hugged me tighter, my hands ended up covering her breasts. Even through her clothes, I could feel that her breasts, while not exactly full, were definitely firm, perky yet smooth like cream. I couldn't help but pinch them. My sister just blushed slightly and looked at me without saying anything. As we walked, my hands continued to caress her breasts, and her face grew redder and redder. She just kept her head down and walked forward. Looking at her face, which was as red as an apple, I really wanted to take a bite, but I didn't have the courage at that moment. Finally, I got home safely. My sister took off her shoes faster than I did, put down her umbrella, and went inside. I took off my shoes and had just stepped inside when my sister came out, holding a towel.

"Here, let me dry your hair."

"I can do it myself!"

"Why are you being so polite with me!" I could only helplessly put my hand down.

My sister slowly dried my hair. Because she was slightly taller than me, I had to look down. Because I was soaked from the rain, my clothes were wet, and two bright red marks were clearly visible on my sister's chest. My face turned red again.

"Why is your face so red? Go take a shower and wash off the moisture. You shouldn't catch a cold so easily."

"Okay."

I rushed to the bathroom as if I were escaping for my life. In the bathroom, I absentmindedly dried myself, thinking about the journey home. I looked at my hands and thought about how soft my sister's chest was.

As I thought about it, my little brother grew bigger and harder, and I felt a burning sensation in my lower abdomen. I'm the shy type, so I've never asked anyone about this. I tried to press my little brother down with my hand, trying to calm it down, but the more I pressed, the harder it became. Frustrated, I gave up and started taking a serious shower. After a long time, my little brother finally calmed down. Suddenly, with a "whoosh," the bathroom door opened. I looked up and was stunned…

A beautiful body was displayed before me. Slightly damp hair was casually draped over her shoulders, her face was flushed, and below, though not full, her breasts were very perky, exposed to my view. Then, the contrast between her flat stomach and a small tuft of hair was so alluring, and her pink lips… Water droplets dripped from her body, one by one, the sound of the water droplets hitting the ground echoing in my young heart! After a long pause, I stupidly asked, "Sister, what brings you here?"

"I was too wet, so I had no choice. We're siblings, let's shower together!"

"Oh," I replied blankly, my mind a

complete blank. My sister naturally rinsed herself off, lathering herself with the shower gel. I secretly glanced at her; from the side, she was even more alluring, with a perfect S-curve, a prominent bust and buttocks, long, smooth, white legs, and delicate, exquisite feet. I stared, mesmerized.

"Xiao Lei, is it pretty?"

"Pretty!! Uh..." I replied idiotically, only realizing after a moment that my sister was asking me. I felt embarrassed and lowered my head.

Then, my sister said, "You've seen so much of me, I want to see you too!" and pouted.

"Ah!" I was very surprised, but seeing my sister's cute expression and beautiful body, I was completely mesmerized.

"If you don't say anything, I'll take it as a yes!"

My sister walked over. I didn't dare look at her, lowering my head, because of my little brother—no! It should be said that my thing got bigger and harder again. I wanted it to calm down quickly, so I tried to push it down, but I couldn't. I had no choice but to cover it with my hands.

"Wow, what is that? Take your hands off, or your sister will be angry!"

My sister was already behind me and saw that I was covering it with both hands, but it was still too big to cover it completely. I was afraid that my sister would really be angry, so I took my hands off.

"Wow, it's so big! I want it so badly..." My sister was surprised and muttered softly.

"Let me see." A light flashed in my sister's eyes.

My sister walked in front of me. Since I was sitting on a small stool, my sister squatted down. My sister's small hands grasped my big thing. My sister's warm small hands enveloped my big thing. That warm and strange feeling rippled through my mind, making me groan involuntarily.

"Xiao Lei, has your teacher taught you any sex education?" My sister suddenly asked.

"Not yet, it seems like it will be next semester." Although it was strange, I still answered honestly.

"Then let me teach you! What I'm holding now is called a penis, you know?" my sister said, pointing to my big thing.

"Oh, so it's called a penis!"

Then my sister touched the tip of my penis with her thumb, revealing a red spot. I shuddered. My sister glanced at me, then grasped my penis and began to move it downwards. "Ah!..." I cried out in pain.

"Xiao Lei, bear with it, it'll be over soon," my sister comforted me, silencing my discomfort.

Finally, a red, turtle-like head appeared at the tip of my penis. My sister explained, "This is called the glans, and what's covered by it is called the foreskin."

"What a perfect image!"

My sister began to stroke it up and down.

"Does it feel good?"

Every time my sister stroked my penis, I felt like I was flying, experiencing heavenly pleasure. I even forgot to answer when my sister asked me. After several dozen strokes, my sister suddenly stopped.

"Feels good, doesn't it?" My sister looked at me with a half-smile.

It felt so good, I wanted it to never stop, I thought to myself. Seeing my sister's ambiguous smile, I was so embarrassed I didn't know what to do. I could only awkwardly reply,

"Comfortable."

"Hehe..." My sister chuckled, her breasts swaying with each movement, making my penis grow even larger. Perhaps sensing the change in my penis, she stopped laughing, her pretty face flushing red. She removed one hand from my erection and continued,

"This is called a breast, and this is called a nipple." My sister pointed to her chest.

Then she grabbed my hand and slowly moved it towards her alluring breasts. In what felt like an eternity, my hand finally touched my sister's beautiful breasts again! I couldn't help but pinch her nipple. My sister gave a soft, coquettish sound and loosened her grip on my penis slightly. My sister looked so beautiful at that moment, her eyes half-closed, a hint of spring in her brows, which ignited a surge of lust in my lower abdomen. My sister leaned forward slowly, and my hand reluctantly left her chest, because she had already fallen towards me. I reached out to support my sister's shoulders, but she fell so fast I wasn't prepared. We both tumbled to the ground with cries of surprise.

"Ah!"

"Ouch! My butt!"

The fall hurt, so we both quieted down and obediently took a shower. After

a quick shower and drying myself, I realized I'd forgotten my underwear. Luckily, Mom and Dad weren't home, so being naked shouldn't be a problem, right? I ran to the closet, grabbed my underwear, and was about to put it on when my sister came over, also naked. She said, "Xiao Lei, don't rush to get dressed, come with me."

"Okay," I replied, dumbly, taking her hand.

We went to my sister's bedroom. It was filled with decorations, and the walls were covered with posters of celebrities, both men and women, all dressed provocatively, some even nude, all incredibly alluring. Looking at them made my lower body feel hot. My sister pulled me to the bedside and said, "Come on, Xiao Lei, lie down."

I obediently lay down, and because of the beautiful pictures on the wall, my penis was already erect. My sister sat down with her back to me, her small hand grasping my large penis, and began to move it. The first thrust wasn't as painful as in the bathroom, but it was still a little painful—painful yet pleasurable!

After playing with it for a while, my sister probably felt it was inconvenient, so she climbed onto the bed as well. At this moment, my sister's beautiful and pert buttocks were facing me, making me dizzy with desire. My hand couldn't help but reach out to touch them, and suddenly! I felt my penis enveloped in a warm, spring-like sensation. I turned my head and saw my sister's head moving up and down. Her cherry-like mouth was holding my penis, teasing my red glans with her tongue. My nerves felt like they were being manipulated and stimulated...

"Ah..."

I felt a force about to burst out of my body.

"Sister, I can't hold back!" With a shout, a stream of liquid gushed out from my lower body. The pleasure of ejaculating felt like flying to heaven.

Most of the liquid sprayed onto my sister's face. I blushed and lowered my head, saying, "Sister, I didn't mean to, I just couldn't hold back."

My sister turned around and sat up, smiled, and said, "Xiao Lei, it's okay, this is normal. This is called ejaculation, and this is called sperm. I just didn't expect there to be so much!" My sister dabbed some on her face and put it in her mouth.

"Is it good?" I asked, puzzled to see my sister eating it.

My sister suddenly asked, "Xiao Lei, are you still a virgin?"

My face flushed again, but I nodded anyway.

"No wonder!" my sister said matter-of-factly.

"Isn't it really delicious? I want some too!" I moved closer to my sister's face.

"It's not that delicious!" I thought to myself, but seeing my sister's expression of enjoyment, I didn't say it aloud.

I carefully licked my sister's face clean, and seeing a little bit left at the corner of her mouth, I continued to explore there. When I licked my sister's lips, my tongue involuntarily darted into her mouth. When my tongue touched my sister's pearly teeth, she didn't stop me, and I felt a surge of secret joy. Then my tongue touched a moist and smooth soft body, which must have been my sister's tongue. My tongue and my sister's tongue intertwined, and my body was already entangled with my sister's. My hands weren't idle either; my left hand was already covering my sister's breasts, while my right hand was exploring down below her.

My hand traced down my sister's flat stomach, and when I touched a tuft of soft hair, I knew I was nearing her secret place. My hand continued forward, touching two soft labia with a small opening in the middle, surrounded by a sticky liquid. I probed the opening with my index finger, and as soon as it entered, I felt its tightness. My sister suddenly let out a soft moan, and I stopped. Our lips parted, and I looked at her curiously, "Sis, what's wrong?"

Seeing her embarrassed expression, I didn't press further. Instead, I raised my hand, pinched my index finger and thumb together, and pulled out a long, silvery thread. I asked again, "Sis, what's this?"

"This seems to be called vaginal fluid. That's what it's called in the movies I watched."

Realizing she'd let something slip, my sister immediately lowered her head.

I pretended not to care and said, "Oh, so it's called vaginal fluid!"

"Yes, its function is to act as a lubricant when the penis enters the vagina." My sister's expression was much more natural than before.

"Come on, Xiao Lei, lie down."

I lay down again. My sister moved over and sat on my lap.

"Xiao Lei, come here, watch."

I propped myself up. My sister touched her genitals and explained to me one by one: "This is called pubic hair, these two soft parts are called labia, this is called the clitoris, vagina, vulva, labia majora, labia minora, urethral opening, vaginal opening... Do you understand?"

"I roughly understand." I nodded, seemingly understanding.

"When you touch or stroke the clitoris, you can feel an extraordinary pleasure," my sister said again. She then played with her clitoris, and soon, my sister's body convulsed, and a lot of vaginal fluid gushed out from her vagina.

My sister grabbed my hand, "Come on, help me."

I didn't know what to do. Seeing my blank look, my sister said, "Use your fingers to help me."

I remembered my sister's reaction earlier, and I was a little hesitant. My sister saw my worry and comforted me, "It's okay, come on!"

"Okay, then I'll go slowly."

I took a deep breath, then placed my index finger at the entrance of her vagina, hesitated for a moment, and then pushed it in deeper.

"Huh? This is much easier than before!" I thought to myself.

My index finger slid in directly, and I added my middle finger to make it fit better. I slowly began to thrust in and out, and after a few strokes, my sister let out a wanton moan. As I increased my speed, more and more fluid flowed from her vagina, and her moans grew louder. My sister excitedly cried out, "Harder! Harder! Faster! Faster..."

Finally, her vagina gushed out a large amount of vaginal fluid once again. I withdrew my finger, and my sister exhaled, looking at me with lingering desire. I thought for a moment, then reached my finger into her vagina again, but this time I planned to gradually add more fingers. Just as my hand was about to reach the entrance, my sister grabbed my hand and said, "Stop!"

"What? Sis?" I was a little confused.

"Lie down, I'll do it myself."

"Huh?...Oh."

My sister sat up, guiding my penis against her vagina and slowly rubbing it. This made my penis grow even larger. Finally, my sister slowly sat down. Although her vaginal fluid had already lubricated it, my penis was already swollen and hard. Seeing my sister's tightly furrowed brows, I realized she must be struggling. Feeling a pang of sympathy, I said to her, "Sister, maybe we should stop?"

"It's okay, I should be able to manage," she replied confidently.

Slowly, her movements rose and fell, and the distance between us decreased, we pressed closer together, and her movements became more pronounced. Her moans returned, that same intense pleasure, even more stimulating than before, assaulting my senses once more. "Sister, I...I...I feel...like it's...about to..."

My sister opened her eyes and immediately stopped. Her small hand touched my face, encouraging me, "Xiao Lei, keep going! Hold on! Don't think about anything, calm down, it'll be over soon."

Hearing her encouragement, I tried to calm myself down, calm, calm, and calm again, finally managing to suppress it. I sat up.

"Xiao Lei is the best! Wow!" My sister kissed me as a reward.

"Hehe..." I chuckled foolishly and scratched my head.

At that moment, my sister looked at me, her eyes filled with a mix of emotions—joy, helplessness, confusion, and relief. A woman's heart is unfathomable! I couldn't help but sigh. After a while, I finally calmed down completely, though my penis was still hard, haha. Suddenly, my sister cupped my cheeks in her hands, a hint of determination in her eyes, and said, "Come on, Xiao Lei, let's climax together."

My sister lay down, her legs spread wide. I pulled my legs back, knelt at the entrance of her vagina, lifted my penis, rubbed it against her opening for a while, and then entered her, slowly pushing forward. I didn't want my sister to feel pain; at this moment, I only wanted her to be happy and comfortable. The piston-like motion began again, thrusting. I looked into my sister's eyes, and she looked back at me; everything was understood without words…

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My sister's physiology lesson

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