When I was 11-years old I caught my sister (13) masturbating her boyfriend (15) on our back porch. My parents were not home at the time and the boyfriend left very quickly after my interruption.

I went to my bedroom, and started to listen to my radio, when my sister came in to my room and started to beg me not to tell my parents what I saw. I let her beg for a bit and then agreed to stay silent IF she would strip for me.

At first, she said no, but after another moment or two, she agreed, as long as I kept my hands to myself. I agreed.

After closing my bedroom door, and locking it, she slowly began to strip. First her blouse and then her shorts. Next came her bra and then her panties.

I really wasn't shocked at the size of her tits because she often wore tighter blouses. What did surprise me was the size of her areoles. They had to be the size of a half-dollar and were puffy. Her nipples were also light pink.

My eyes then drifted to her lower regions where I expected to see blonde pubes, like the hair on her head, but that wasn't the case. Instead, she had a full brownish bush that seemed to stick straight out.

I had the urge to reach out and touch her, but I resisted and kept my end of the bargain.

As soon as she left the room, I unzipped my fly and massaged my small penis until I had a dry orgasm.

To this day we often joke about this incident, but haven't, to my knowledge, told anyone else.