I couldn't sleep. The house was quiet, the only sound the soft hum of the air conditioning. I glanced at the clock - 2 AM. I sighed and flopped back onto my pillow.
But my mind was racing, filled with thoughts of Sandra. My younger sister and I had always been close, but lately, I couldn't help but notice how grown-up she had become. She was twenty-two now, and her body had filled out in all the right places.
I reached over to my bedside table and pulled out my trusty vibrator. I had always been a bit of a lonely soul, and this little gadget had been my faithful companion for many a night.
As I started to pleasure myself, I heard the sound of water running in the bathroom. It was Sandra, getting ready for bed. I paused, my hand still on the vibrator. The thought of her just a few feet away, naked and vulnerable, was too much to resist.
I quietly got out of bed and tiptoed over to the bathroom door. I pressed my eye to the keyhole and saw Sandra standing in front of the mirror, completely naked. She was stunning, with curves in all the right places.
I couldn't help but let out a little moan as I watched her. Sandra heard me and turned to look at the door, a playful smirk on her face.
"Hey, perv," she said, "enjoying the show?"
I blushed, but I couldn't deny that I was. Sandra continued to get ready, completely unselfconscious about her nudity. She bent over to pick up a towel, giving me a perfect view of her round, firm ass.
I was so turned on that I couldn't help but cum, right there on the spot. I quickly cleaned myself up and tiptoed back to bed, my heart racing.
I heard Sandra laughing on the other side of the door. "Don't worry, big brother," she said, "I won't tell anyone about your little peep show."
I lay in bed, my mind racing with thoughts of Sandra. I couldn't believe what had just happened, but I knew one thing for sure - I couldn't wait to do it again.
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