My girlfriend's younger sister, Xiaoting

I used to be a high school math teacher, 175 cm tall, 70 kg, and quite young, around 31 years old. Back then, I was eager to learn and had a lot of drive, and I was already a homeroom teacher at the school. My girlfriend was an administrator at the same school. I often visited her home, so I was quite familiar with her environment. I've been very busy lately and haven't been going as often, but there's no need for formalities. Last week, I took out my spare key, opened the front door, and stepped into the living room. I was a little startled to see my girlfriend looking disheveled. I asked, "Xiaoting, what are you doing at home? Where's your sister?" I automatically took off my shoes, put them in the shoe cabinet, and sat down on the black sofa. My girlfriend treated me like family, casually sitting down at the other end of the sofa with me. She was still holding her bathrobe in one hand and casually pressing the towel on her head with the other. With a shake of her head, her thick, dark hair fell down, shimmering, and she then rubbed the ends of her hair with the towel.

"Isn't she supposed to be back from her business trip tomorrow or the day after?" my girlfriend asked, drying her hair.

"Ah! I got the date wrong," I said, scratching my head. "I thought she'd be back yesterday or today!" "Didn't you call her? What's up?" my girlfriend asked, her legs crossed, her private parts inevitably showing through her bathrobe.

"Nothing much, just wanted to chat since I'm on vacation," I said helplessly, shrugging.

Without further ado, I began to introduce the protagonist of this story. My girlfriend was 19 years old, 158 cm tall, and had a 32C bust. She had a round forehead, delicately curved eyebrows, long eyelashes, and smooth, delicate cheeks. But what I longed for most were her alluring lips. These lips were full and thick at the bottom, with a beautiful curve at the top, forming a small bridge, with a tiny bead forming at the tip. Her lower lip was round and plump, like a cherry still glistening with dew. Even though her lips were closed, there was still a small indentation in the middle. Sometimes, she would gently stick out her little tongue to moisten her lips, the tip of her tongue gliding across the lip line, a subtle yet alluring gesture.

Although I often saw my girlfriend, I had never seen her so beautiful after a bath. I couldn't help but swallow, my erection visibly bulging, making me restless.

My girlfriend noticed this, licked her lips, and smiled inwardly, thinking, "Men are all lecherous." She draped a towel over her shoulders, stood up, and said, "You haven't been here in a while. Sit down for a bit, I'll get you a cup of black tea." She then went into the kitchen. Watching her swaying back as her large buttocks moved, my heart suddenly tightened. I thought, "My girlfriend is so beautiful!" When she returned to the living room, her bathrobe was already tied and belted, so there was no need to hold it anymore. She brought two cups of black tea, bending down to place one on the coffee table in front of me. She noticed my eyes darting around, searching for her bathrobe. She paused for a moment, still holding that pose, thinking, "I'll make you laugh so hard if you peek!" My girlfriend sat back down, put down her tea, and then raised both hands to fix her hair. While chatting with me, she turned her head to the side and rubbed lotion, causing her upper body to sway slightly. I saw the cross neckline of her bathrobe gradually slip open, revealing a small part of her round, full, snow-white breast. My girlfriend seemed unaware and continued to rub her hair, her breast gently swaying. I wanted to look but didn't dare to stare, my mouth watering and swallowing repeatedly.

As I watched my girlfriend's soft breasts sway and reveal more and more, I forgot all about manners, my eyes glued to them. Her breasts were still bouncing, and her nipples were about to peek out when suddenly she stood up and said, "Sit a little longer, I'm going upstairs for a bit." Then she turned and went upstairs. I was actually quite disappointed, looking at her swaying buttocks—so round! So perky! Not even a crease from her underwear. Could she be completely naked underneath?!

I waited until she was completely upstairs before quickly unzipping my pants and adjusting my already hard penis. Oh no, I berated myself. This is someone else's girlfriend, how could I have such thoughts? I came to see my girlfriend; since she wasn't here, I should leave quickly. But now I couldn't bear to leave; my mind was racing with lust. My girlfriend told me to sit a little longer, so I sat a little longer! I kept wondering what would happen next.

When my girlfriend came downstairs again, she had changed into a tight pink off-the-shoulder top that accentuated her bust and slim waist, paired with a pair of casual denim shorts. They were actually hers; she thought I didn't know, so she went out of her way to get them for her. Dressed so coolly, whenever she turned her back, the cute lower edge of her buttocks was always visible, and I could see it.

My girlfriend returned to the sofa, picked up her slightly cold black tea, took a sip, and asked, "By the way! Don't you have to teach today?" "Ah! Yes, I had the day off and just came over for a visit," I said, pretending to casually reach for a stack of newspapers on the table. Somehow, I knocked over my black tea, spilling it almost all over the floor.

"Oops! This is terrible!" I exclaimed in surprise, looking around frantically for something to wipe it up.

"It's okay, I'm not busy," my girlfriend smiled at me. She told me, "Don't move, I'll go get some rags so you don't get your clothes dirty." My girlfriend went to the kitchen and brought back two rags. She bent down and wiped the tea on the table, and I saw her full breasts again, mostly exposed by her bra, soft and plump. Ah, she probably wasn't wearing a bra. Really, if she showed just a little more, I could see her nipples. My girlfriend wiped the table with her arms, and those two mounds looked like they were about to shake out. My heart pounded wildly.

My girlfriend squatted down to wipe the floor, and the sight became even more prominent. Her bra couldn't support the weight of her breasts and was stretched open, making her cleavage more defined. I felt my penis was throbbing, and I really wanted to fuck her. My girlfriend kept shifting around on the floor, eventually kneeling with her back to me, her round, beautiful buttocks sticking up high. Her shorts were so short that the hem naturally curved into an arc, half-hidden and half-revealed, showing off her entire thigh, the lower half of her tender buttocks, and even her dark pubic hair. I almost wanted to pounce on her and fuck her, but I could only think about it. It was too hateful!

My girlfriend finally finished cleaning up. She turned around and smiled at me, saying, "I'll make you another hot cup of tea." Then she stood up, pretending to have a sore back, and deliberately straightened her chest and stretched before going back into the kitchen. Sure enough, she soon brought out a fragrant cup of black tea. This time, I didn't let her put it on the table. I reached out and took it, casually touching my girlfriend's small hand. She smiled and let me take it. I took out my laptop, sat on the sofa, turned on the Wi-Fi, and casually browsed the internet. I took a sip of black tea. My girlfriend came over and stood next to me, casually reading for a moment.

"Ha, this news is hilarious." My girlfriend laughed, seemingly at something.

"What? Where?!"

Intrigued, I turned around to ask her. She smiled and leaned down close, saying, "Wait a minute, I'll take another look." I hadn't expected her to lean down. As I turned, my hand accidentally hooked under her bra. I was startled, instinctively recognizing it as impolite. I should have pulled my hand back, but my fingers were stiff and wouldn't straighten. With a "whoosh," the bra was immediately pulled off, revealing my girlfriend's smooth, glossy breasts.

My girlfriend and I were both stunned. She turned around blankly, and that made things worse. Her right breast had completely broken free of her bra and was now completely naked in front of me. I just stared at her dumbly. On my girlfriend's fair breast, I could still see the faint outline of her bra. Her breasts were perfectly round, with large brown areolas and small, grape-like nipples standing upright. My girlfriend looked back at me with a shy blush. We both stopped what we were doing and stood silently facing each other.

About five minutes passed before I snapped out of it. I reached out with trembling hands, carefully pinched the top of her bra, and pulled it back into place to cover my breasts again. Ironically, perhaps trying to comfort my girlfriend, I patted her breasts like I was soothing a child. She looked at my innocent, pitiful expression and couldn't help but chuckle. She took a small step closer, and I nervously looked at her, saying, "I'm sorry, I didn't mean to." She moved even closer, pretending to look down at me innocently. I quickly looked away, only to find myself staring directly at her breasts, which were almost touching my nose. I couldn't help but gasp for breath.

"What? What's wrong, brother?" my girlfriend asked.

"Nothing!" I quickly replied, swallowing hard.

"Am I pretty?" my girlfriend asked shyly.

"Yes, Xiaoting is very pretty," I said, feigning composure.

"Then why aren't you looking anymore?" my girlfriend asked, her eyes wide.

"I...I..." I couldn't answer.

My girlfriend bent down, bringing her face close to mine so we could look at each other.

"Why aren't you looking?" she asked again.

"Smack!" I suddenly kissed her lightly on the lips, startling her.

She straightened up, pulling down the bottom of her bra with both hands. The elastic band slid with difficulty over her breasts, stretching them tightly. Suddenly, her breasts bounced, the bra broke free, and her breasts were clearly presented before me.

I couldn't take it anymore. I grabbed her around the waist and buried my face in her soft embrace, indulging in her cleavage. She gave a slight resistance, letting out a soft "Ouch!" Then she hugged me and whispered, "You're so annoying!" I was still sitting on the sofa when she sat down, straddling my knees and facing me, gazing at each other.

She whispered, "Brother, I hate that you're so lecherous."

Hearing such cheesy words, I almost melted. I said lewdly, "You have such a great body! I really want to fuck you!" I cupped my girlfriend's face and kissed her. My hands gripped her buttocks, touching them not only outside her shorts but also inside, kneading them together with her briefs. Her buttocks were soft and elastic, feeling incredibly comfortable. She squinted her alluring eyes, leaned against me, and pushed me down onto the sofa. She leaned against me, boneless, and I still lingered on her buttocks, extending my hands between her legs, one hand touching her inner thighs, the other touching her warm opening.

"Ugh, don't do that, it'll make me blush," she said, lowering her head and panting.

I pulled her hands up, using them to prop herself up on me. Then, my palms and her small hands together covered her full breasts. I'm not stupid; I immediately began to knead them lightly and heavily, even playing with her already erect nipples with my palms. My girlfriend let out "mmm" sounds in welcome, her lower body swaying between my legs.

"Do you like me?" My girlfriend asked, her eyes closed, a wanton smile on her face.

"Yes."

"What do you like about me?" My girlfriend tossed her hair.

"You're very beautiful," I said.

"My sister is beautiful too!" my girlfriend said.

"Not as beautiful as you, but I also like your big, round breasts," I said.

My girlfriend opened her eyes, got off me, and slowly swayed to the center of the living room. She took off the tank top around her waist, then unbuttoned her shorts, turned around with her back to me, and moved her toes up and down, making her hips undulate like waves. Then she slowly pulled down her shorts, sticking out her round buttocks, letting me see the alluring sight of her white briefs bulging on her buttocks. She turned back, and the shorts loosely fell to her ankles. She kicked them, and they slid to the ground.

I sat up halfway and grinned wickedly, saying, "Oh, you're beautiful from head to toe. My god, your curves will drain a man dry." I was almost a head taller than my girlfriend when I stood up. She took off my suit jacket and tie and threw them aside, then unbuttoned my shirt. She then stuck out her tongue and began to lick my nipples. I let out satisfied moans, and she gently bit my nipples. I enjoyed the gentle service of her tongue.

My girlfriend unbuckled my belt, pulled down my pants, and let them slide down automatically. Then, through my underwear, she gently stroked my penis, which throbbed, almost making me ejaculate.

My right arm was around her waist, sometimes darting close to her undulating back and buttocks, tickling her and making her giggle. She leaned her head against my chest, and I kissed her, my left hand lovingly stroking her cheek. She rubbed her face like a cat, wriggling in my palm, feeling both sweet and pleasurable. I thought lewdly, "Hehe! How should I play with her now?!" My large tongue swept incessantly in her mouth, sending her saliva, which she didn't mind, swallowing it mouthful by mouthful. She excitedly wrapped her arms around my neck, while twisting her lower body to rub against me.

Finally, they separated, their mouths smeared with each other's saliva. My girlfriend, with her big, bright eyes, stared at me, grabbed my hand, turned around, and hid behind me. She pulled down my shirt, pressed her breasts against my back, and reached her arms around my front, slipping them inside my underwear to grab my penis.

My thick penis throbbed under her fingers' caresses. My girlfriend kissed my shoulders and back all over, while her hands took my penis out, her right hand holding it in place, and she began to stroke it rhythmically, her fingers gently kneading it up and down, back and forth. Her left hand cupped my scrotum, gently stroking it. I felt a surge of pleasure, closed my eyes, and looked up, enjoying her ministrations.

"Is it good, brother?" my girlfriend whispered.

"Ah, so good," I growled softly.

"You're naughty, your penis is hard," my girlfriend whispered again in my ear.

"Oh my god, hehe, I'm going to fuck you to death," I growled.

"Ugh, so annoying!" My girlfriend let go of me and shoved me away.

I was in the middle of a passionate encounter, and suddenly I was left without a place to rest. I was as anxious as an ant on a hot plate. My girlfriend chuckled playfully, giving me a "let's see what you do" look. I was going crazy. I grabbed her with my hard penis, but she twisted her waist, dodging me left and right. We giggled and laughed as we moved around the living room, our passion overflowing.

Later, my girlfriend pretended to fall onto the sofa. I jumped on her and pounced on her. She begged for mercy softly, stretching one leg out and arching the other, beautifully displaying her buttocks and labia. Then she turned and gave me a captivating, seductive smile. My blood boiled, and my penis rubbed against her vulva.

"Oh, you're so naughty, you bad man!" my girlfriend moaned wantonly.

Now I was even more obsessed, my eyes reddening. I grabbed my girlfriend's panties and tried to pull them down. She kicked her legs, but I managed to pull them down to the junction of her thighs and pink buttocks, revealing her smooth, fleshy peach. I wasn't about to let her go. I quickly squeezed my head in and began to bite, kiss, and lick that white flesh with meticulous care. My girlfriend felt both sore and itchy, rolling and dodging on the sofa, laughing until she was breathless. She had just finished showering, her body smelled wonderful, but she was suddenly covered in sweat again.

"Oh, please don't forgive me, I won't do it again next time," I said.

I was so wicked. I stuck out my tongue and licked my girlfriend's anus.

"Oh no, I don't want to! Don't bully me! Oh, I'm so pitiful!" I continued licking, driven by my wicked desires. My girlfriend's anus contracted rapidly in panic. I occasionally lowered my tongue, but just a few centimeters away, I naturally licked and dug into her sticky, wet opening. She immediately cried out again, "Ah, no! No! Ahh, don't!" But I still licked back onto her anus. Her face contorted in pain, her legs arched. I tried to pull off her panties, but she held onto the waistband, laughing incessantly, only letting me see half of them. So I simply pulled her legs and flipped her over. She cried out, "Ah!" and was turned onto her back, but her panties still covered her thighs, preventing me from easily glimpsing her private parts.

My girlfriend spread her arms, feigning resistance, and tried to hit me. I leaned down and kissed her face. Her cheeks were already burning hot, and she smiled shyly. She reached behind her buttocks and grabbed my large penis again, gently holding it and affectionately stroking it. I was already painfully hard, and in my girlfriend's hand, it felt like an iron rod.

"Mmm, I can't take it anymore, I want it," my girlfriend said, blushing... I slowly moved forward, looking at my girlfriend, and she looked at me. When we gently touched, we both felt a tingling sensation. I felt my glans being enveloped by something warm and smooth, an indescribable pleasure. My girlfriend also felt the most sensitive flesh at the entrance of her vagina being attacked by something powerful, and she closed her eyes and moaned softly.

"Ah, brother, I can't take it, come in, all the way in, mmm," my girlfriend said, shaking her buttocks at the same time.

I pushed forward hard, and my girlfriend cried out, "Ah, ah, you're killing me!" Her eyes rolled back, and my large penis went all the way in.

"Oh my god... oh conquer me," my girlfriend moaned. "Move faster, I'm so wet and hot." Before she could even say anything, I was already thrusting. She held me tightly, moaning incessantly.

"Hehe, do you like me fucking you?" I asked deliberately with a smile.

"Mmm, I like it," she whispered

. "I'm... ahhh," she said. "I'm being fucked, it feels so good." I said, "Hehe, my dick is big, right?" "So big," she said. "Ugh, I can't take it anymore, it's so hot, it feels so good!" I straightened up, kneeling on the sofa, thrusting hard. Her thighs were wet with her juices, her legs were lifted and placed on my right shoulder, only parting cutely from the knees.

"You're so naughty, I'm so horny, harder! Ahh, I'm so embarrassed!" 　　"You're so

slutty, watch me fuck you to death!" "Ahh, okay, fuck me to death! You're so amazing! Ahh, ouch!" 　　"So strong, I'm going to cum! Ahh, I hate it!" 　　I dared not slack off, my ass was fucking fast, and my girlfriend was also welcoming and wandering. As soon as my penis was pulled out, she immediately thrust it up hard, making the two of us love each other without any gap. 　　"Oh, hurry up and finish! I can't take it anymore! I'm coming! I'm coming!" My girlfriend looked confused, but her face was full of that lewd smile again. Her pussy was already a little red. I stopped and lay on top of her, asking, "Is it good, mmm?" "Ugh! I don't know!" My girlfriend said with a blush. 　　"Do you usually have sex often?" 　　"Yes, my boyfriend is also very strong," my girlfriend said, "but not as good as you!" "Is your boyfriend's penis big?" I asked again. 　　My girlfriend giggled: "I won't tell you." 　　"Oh," I said. 　　"What are you doing?" My girlfriend cupped my head, "I like you, I'm willing to do it for you." "Are you really comfortable?" "What do you mean 'really'? It's comfortable, it's comfortable!" My girlfriend pouted her round lips. 　　"Smack!" I kissed her lips. 　　Suddenly, my girlfriend flipped over and sat on top of me, tightening my penis inside her. 　　"I want one more time! Okay?" My girlfriend raised her eyebrows at me. 　　As she spoke, my girlfriend gradually started to sway her hips, then swayed faster and faster, her breasts shaking like a raging storm. I looked at my dignified girlfriend in disbelief, only to realize that she was so lewd inside. 　　"What are you looking at?" My girlfriend deliberately provoked me, "Put your big penis inside me!" Hearing this, my penis became rock hard again, and I angrily thrust forward, making her scream. 　　"Laugh at me, you dare laugh and I'll fuck you to death!" 　　"Me? I'm not afraid! I'm not afraid of being fucked!" 　　"Haha, I didn't expect you to be so slutty and wanton! 　　" I said. "Ah, I need to be 　　fucked!" "You—" I asked boldly, "Do you often cheat?" 　　"No, it's only been this once with you!" 　　"But you're so wanton!" I said. 　　"Because I like you." My girlfriend asked, "Don't you usually want to fuck me when you see me?" "I really do!" I said, "But you're my girlfriend, I usually don't dare." "Ah, now you've fucked me!" she said shyly. 　　"Haha, so good, I'll fuck you to death!" I said. 　　I pushed myself up, sat up straight, hugged my girlfriend tightly, lowered my head and bit her nipple, kissing it without restraint. My girlfriend went from pain to stimulation, hugged me tightly and screamed loudly, her whole body moving up and down non-stop, making me feel extremely good. 　　"Ah, I'm about to cum!" I roared with my head down. 　　"Okay! Shoot it in, shoot it into her flower core!" Hearing this, my girlfriend's breasts jiggled even more violently. 　　"Ugh, I can't hold back anymore!" I was pushed to my limit, and a stream of semen immediately sprayed into my girlfriend's wet pussy. I must have been accumulating for a long time, it was really thick and plentiful. 　　"Ah, it's so hot!" My girlfriend laughed at me, "You've already surrendered 　　?" "You slut!" I gritted my teeth and said, "I'll be able to fuck you until you beg for mercy right away!" "Really? Don't come after just two thrusts!" My girlfriend deliberately sat down hard a couple more times, and said in surprise, "Oh! Really! It's hard again." Hearing her say that, my penis immediately became rock hard again. I flipped over and pressed my girlfriend back onto the sofa, yelling, "I'll fuck you to death, I'll fuck you to death!" I immediately and hurriedly thrust my penis into her pussy, fucking her like a storm. 　　Then neither of us had time to talk. My girlfriend was busy moaning and groaning, while I frantically thrust my hips back and forth, pumping my penis in and out with lightning speed, giving it my all. She was splashing water everywhere, yelling "brother!" and "sister 　　!" as we went on. As we continued, we both got tired. One of us slipped and fell onto the sofa, then rolled onto the floor, looking disheveled. We couldn't help but laugh at each other. I held her close, my penis still lingering in her wetness, and we continued thrusting together on our sides. This position couldn't be done by just me; she cooperated by lifting her hips, practically squeezing me into hers. I bit her neck, and she bit my shoulder. Suddenly, we both felt a tingling sensation in our genitals, and my semen gushed out. She screamed and clenched her vagina tightly, and we both reached orgasm. 　　We lay on the floor, lazily kissing and unwilling to get up. My girlfriend asked, "Do you prefer the dignified me or the cute me?" "I like both, Xiaoting!" I said, "Oh no, I'll definitely get hard every time I see you." "Then come and fuck me!" my girlfriend said with a smile. 　　"How can I fuck you when your sister is here?" 　　"It depends on your skills!" my girlfriend said, "Get up! Now come with me to take a shower." I got up first and reached out to help my girlfriend up. My girlfriend looked at my penis, which had shrunk into a small ball, and laughed as she played with my penis with her hand. She licked it a few times, then took my arm and stood up. We walked into the bathroom, our arms around each other's waists.

Like newlyweds, we splashed and played in the water, making a ruckus in the bathroom. Then my girlfriend took some shower gel and carefully washed me. I had her sit on the edge of the bathtub and lathered her entire body with foam. She felt completely relaxed and closed her eyes, letting me touch her.

I chuckled and immediately started licking her smooth vulva.

"Oh, you're so mean! Oh, so good, lick me, lick me! Oh, so good!

Ahh!"

My mouth tasted salty like urine, but I was almost going crazy. My tongue plunged deep into her vulva. My girlfriend was so happy she couldn't sit still and slid down onto the tiled floor. I kept my head buried in her vulva, unwilling to let go, until she came once more. Only then did I mount her, and we embraced passionately again.

"Oh, big dick brother, oh, Xiaoting likes you so much! Your dick is so strong! I love it! Big dick!" Every time my girlfriend said my dick was big, I thrust even harder. She was in heaven, and kept saying "big dick, I hate it!" I'm not made of iron, and after a few rounds of intense thrusting, I finally couldn't hold back and ejaculated.

"Xiaoting, Xiaoting, I'm going to cum!" I roared to the sky.

"Brother, wait for me! I'm coming too! Let's go to heaven together!"

Our shower was a waste, so we had to shower again. Since we didn't have any energy left for flirting, we finally got really clean. I took Xiaoting to a restaurant, had a romantic dinner, and then took her home, kissing her goodbye at the door.

[The End]

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My girlfriend's younger sister, Xiaoting

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