Totally inappropriate, but it happened anyway.

When my sister started to go through puberty I would strip off her shirt so I could look at her boobs. She had really nice boobs. When she was fourteen I made her show me her girl parts, spread legs and all. I showed her my penis, which was hard as a rock.

She has great boobs, fully mature with nice nipples. I still look at them, she calls me a pervert but she lets me.