Me and my younger sister

My younger sister and me were very friendly from my age of 15 and her 10.But it was pure in those days.But when I attained 18 age and she 13,one incident happened. We were alone in first floor,when I was reading an interesting story published in a newspaper. My left hand was touching her small soft boobs. Although she could have moved away to avoid the contact ,she was still in the same position. So I understood that apart from me,shevwas also enjoying the contact. Then for the first time I developed sexual desires towards her. I wanted to see her naked body. One day we both were all alone at home. She was bathing.I peeped standing on a platform in kitchen which was adjacent to the bathroom. She was turning away from me and was washing hair keeping the head below the tap.In that position, her boobs were hanging and swaying.In normal dress, she always seemed to be very thin. But now in the naked condition her boobs were sufficiently big and her buttocks was very wide and rounded. After enjoying the sight for about ten minutes, I got down and immediately reached the adjacent toilet and had a nice masturbation.Since I knew that she didn't see me peeping I faced her as though nothing special happened. After wards at least once a month, when we were all alone at home, I peeped during her bathing.After about one year our dad was away for one month on some official duty. So I occupied his cot. My younger sister along with two of her sisters used to sleep on the floor adjacent to the cot.One day at midnight I found the sister lying on her sides. Making sure that all of them were fast asleep, I carefully inserted my right palm into her blouse ( she had not started wearing bra) and petticoat. Palm reached her sufficiently big, soft but firm boobs. I pressed hard her boobs one by one with my right palm for about fifteen minutes and slept. From next day every alternate nights at midnight I carried on my naughty activities. Since she never woke even once,I thought she never knew my activities . ( But after six months or so I came to know from her only that she was knowing my naughty activities.