After just five minutes it happened! I don't know how my brother felt, but I was in an almost instant state of shock. Without the slightest warning she pulled off her t/shirt and bore her little bosoms. I was at that age when I thought about girls' breasts once every five minutes.And here she was, just all of a sudden. And although she was only a slip of a girl, her little titties were big enough to bounce as she lept about. How pretty she was! From that first day I was in love. But I felt so ashamed of the lust I felt for her. It also started from that same day. I had to stop playing and lie on the ground to hide my erection. How my brother managed I just don't know. He was younger than me, but still old enough to be thunderstruck by the sight of little Sonia prancing topless before us....

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