Curious little sister

one day after school, my little sister came into my room and started asking me a lot of questions about sex. she had been talking with her friends at school and wanted to know how it worked. i didn't know much about sex but i told her that the boy's penis gets hard and stiff and goes into the girl's vagina. she said she had never seen a penis and asked me to show her mine. she watched in fascination as i took my clothes off and proudly showed her my privates. "now show me yours", I said, and she took her clothes off. "So your penis goes in here?,"she asked, pointing to her vagina. i had never seen a vagina before and my penis began getting big and hard. "it's growing", she said, "that means you can put it in my vagina, right?".
"I think so", I said. My sister stepped towards me until my penis touched her belly button. it tickled her and she giggled. "it's so big now, how does it fit?", she said as she curled her little fingers around it and guided it towards her pink little slit. my sister's vagina felt warm and wet as i slowly pushed the tip of my penis inside her. she gasped and i started stopped, scared i was hurting her. "keep going, it feels so good!" she said she wrapped her arms around me, sliding my penis deeper in her vagina until i could go no further and her nipples touched my chest. our lips almost touching, my sister kissed me gently on the lips. "i love having sex with you, big brother". i nodded my, penis sliding in and out of her vagina as we continued kissing passionately until i felt a tightening in my balls. i moaned as I felt my penis spurt wet stuff with every thrust, deep in my sister's vagina. "what's that?" my sister gasped, "mmm it feels warm". "i think it's sperm", i said. I pulled my penis out of my little sister's vagina and some white stuff started dripping down her leg. she scooped some up with her finger and tasted it "mm it tastes so good, i love sperm, let's have sex every day!"

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