I was at my older sister's husband's birthday party; my sister had invited me, so I went to spend the day there. The party was great—loud music, plenty of drinks—but I ended up losing control. I drank way too much beer and really let loose; I started dancing, shouting, and shaking my butt. I happened to end up right next to my sister's husband and started grinding my butt against him. My sister saw this and got annoyed; she scolded me and dragged me into the living room. She kept complaining at me and told my nephew to keep an eye on me.
I was still in a wild mood and wanted to go back out to the backyard, but my nephew stopped me. I said, "Let go of me! Let's go back to the party!" My nephew replied, "Auntie, stop! Mom is really upset with you. If you go back out there, she's going to kick you out of the house." I pleaded, "I'll behave, I promise! Just let me go—I want to dance some more." My nephew wouldn't let me; instead, he pulled my hand toward the sofa. "Auntie, you're drunk. Why don't you just sit down? We can watch a movie—it's way better than staying out there in all that noise." I insisted, "I just want to dance a little longer, then I'll come back and watch with you." But my nephew still wouldn't let me go; he pulled me back again, bringing my body right up close against his. "Fine," I said. "If you won't let me leave, then I'll just dance right here."
I started dancing, and after a little while, I began shaking my butt and backing myself up right toward my nephew. He tried to get away, but my butt was big, and his escape attempt failed. My butt ended up pressing right against my nephew's hips, and I started grinding right there. I was wearing a yellow skirt with no panties underneath, and he was wearing denim shorts. I kept grinding against my nephew, and he groaned, "Auntie... *ahh*... please, stop!" He said that out loud, but I could feel his penis getting hard inside his shorts. His penis grew and became completely hard. My gyrating caused my skirt to ride up, beginning to reveal my huge ass, and my nephew’s penis was throbbing. I looked back and saw his face flushed red as he let out very soft moans. The head of his penis slipped out of his shorts and was exposed. He tried to push me away but failed, and his hands ended up right on my ass. This was too much for him; he said, "Auntie, please stop! Something is going to happen if you don't." I ignored him and kept grinding against him when, suddenly, his penis ejaculated. He let out a loud moan as a burst shot from his penis; his semen flew all over my ass and back.
My ass and back felt warm from the semen, and my nephew was panting. I pulled my ass away from him and took a step forward. "Oops, I think I crossed the line! Hahaha. Sorry, nephew—that wasn't supposed to happen." He blushed and didn't even answer. His penis began to go soft and retreat back inside his shorts, while my skirt slid back down, hiding the mess my ass was in—though there was still semen on my back and clothes. After a while, my sister came to check on me, but my nephew and I had already cleaned up the mess; we simply pretended that nothing had happened. He was 20 years old at the time, and I was 32. That was our secret—one we have kept to this very day.
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