My sister taught me_(0)

I have always loved my sister. She always treated me well and I treated her well. I have never thought about her sexually. At my age I did not know anything about sex or masturbation until this night.

My sister was very developed for her age, she had huge breasts. I had never seen a girl naked before. This one night my sister called me into her room and told me to sit down on her bed. She then locked the door and sat on the bed with me. She was wearing a tanktop with no bra, you could see her erect nipples through it, and she was wearing short shorts and I think a thong. Looking at her like this made my penis stiff as it sometimes did before, but I always wondered why it got stiff.

She wanted to know if she could ask me a question and I said “Yes”, she then asked if I ever played with myself. I asked what do you mean. She said you know, do you masturbate. I told her I have never heard that word before. She then said do you play with your penis and I said no.