My sister was 12 & I was 11 when I noticed that girls were different to boys. We were each others best friends at that age and very close. We had always bathed together and my mom made sure we did to save water. I can still picture my sister. Honey blond hair, red ruby lips,green eyes and a small straight "very cute" nose. She had little golden hairs on her arms as well as the top of her thighs & her lower back. My sister always had a tan line from here bikini bottoms but not her top. When we would play at that age we would look like 2 little boys, one just had longer hair! I started noticing my changing sister when my mom took her to buy underwear one Saturday morning at the mall. I had stayed with the elderly neighbours next door when my mom hooted for me to come home as they arrived. When I got in my sister was already in our room, and my mom was making lunch. I was talking to my mom when my sister came into the kitchen and asked me if I wanted to see her new clothes, I agreed and went with my sister to our room. My sister started what she called her fashion show and showed me all her outfits, the last time she came out she was just wearing her new panties and tiny bra. I asked her why she was wearing the bra as she was not much bigger than me but she replied her body was changing. As she took off her bra to show me how her body had changed I was still a little confused. The bra removed, she took my hand and placed it on her little pink nipple. She asked if I could feel her little bump and as small as I was I swear I could. She explained that the bump would only get bigger and mom wanted her to be ready and had told her to wear the bra every second day for a hour to get used to it. My sister then said she would show me something cool after lunch. My mom then called us for lunch and I spent the next 20 minutes quietly wondering what my sister was going to show me. I let my sister go to our room first and I then joined her. Her costume was on the bed and that meant swimming, as I got my costume out my sister came nude out the bathroom. She took my hand and we sat on her bed. She told me to play with her nipple and tell her how it felt. I felt it harden and when I looked at her tiny nipple it had grown! I got excited and asked her if the other nipple grew and she advised me to check. I had been playing with my sisters hard little nipples for about 10 minutes when I decided to bend down and start sucking them. My sister was not ready for that and was trying to push my head away when she stopped doing so. I carried on licking and sucking my sisters tiny nipples going from one to another till she asked me to stop. When I stopped and sat up opposite my sister I noticed she was breathing a lot faster and she had this silly smile on her face. I asked her why she had her silly grin and she said she liked what I had done as it made her stomach full of butterflies and she felt a tingle and was wet in her "special place" as mom called it. I asked if I could feel how wet she was. She then took my hand and asked me to point my finger and slowly inserted my finger into her tiny hole. She was sure wet and I asked her if she had peed while I was sucking her nipples, she said her "speacial place" just started getting wetter & wetter and she did not want me to stop as it felt so nice what I was doing. As my finger explored and I looked at her I decided to taste her wetness and withdrew my finger and tasted my sister for the first time. I smiled at her and told her proudly that she did not pee when I was busy on her nipples and told her maybe she should ask mom what had happened. I then offered her my finger and my sister tasted her juices and then proudly said she tasted nice. I could not have agreed more.