Here is a quick story I thought I would share. I was out with friends last Saturday night. My parents were gone for the weekend leaving my 16-year-old sister and me at home. I had planned on spending the night at a friends house, so I guess my sister thought she had the entire house to herself.
I ended up coming home early (around 2:00am). As I walked by my sister's bedroom, I heard the bed creaking. Her bedroom door was slightly cracked and her room was slightly lit by a nightlite, so I peeked in. She obviously didn't hear me when I walked up the stairs and down the hall. My sister was laying face down on her bed completely nude. Her hands were underneath her genital area and her butt was moving up and down.
I watched her for a few minutes as she humped her hands while she breathed in short quick breaths. After a few minutes, she had a very obvious orgasm. I quickly hurried to my room so she wouldn't know that I had seen her. I will never let her know that I caught her because I don't want to embarrass her, but now I know that my little sis enjoys masturbating just as much as I do!