At the time I was just thirteen. For my age I was quite responsible. I’d come in from school that day to find a note from mum and dad saying they had gone shopping and would be back in a couple of hours. Seeing not much food in the kitchen cupboards I had decided just to have some cornflakes. A few moments passed as I heard a car drive up, it had to be my sister. My sister is eight years older than me, and yes, was still living at home. She did the usual thing when she entered the house by shouting either for mum or dad. I shouted to her that both were out shopping so she came into the kitchen. We did the usual sister brother banter before she began searching the cupboards for food. I just sat there smirking to myself as she started to rant about why there was no food and that she pays her keep etc. My sister works for a local bank and earns a good wage, so I could see where she was coming from on that point. My sister was and also has been a busty girl with all the right curves. Not fat, just a good healthy size. I’d first noticed this at the age of ten and since then I’d always looked at her figure. On this particular day I felt extra horny. In school a few of us had managed to look in on the girls shower room through an open window. Don’t ask how we weren’t caught. The sight’s of girl’s bodies developing was electric. Some had large dark bushes while others had little hair on their pussy. Some had large boobs while others had very little. There was one ginger haired girl there with huge breasts hanging down plus a whole covering of think ginger pubic hair! That had set my hormones raging. My sister was always clean looking and smart. She had to be working in a bank. She always wore a small fitting black skirt which showed off her smooth hairless legs, with a white blouse, which showed off her white bra being filled by two large boobs and an over coat. This dress sense didn’t help my raging hormones at all today. She was still moaning about how there was no food in the house when she bent over to open the fridge. My eyes went straight to her large wide bottom. It was sticking out and taunting me. I felt my penis stiffen in seconds. She started to sway her bottom side to side as if trying to charm me. I knew this couldn’t be and just a fantasy which was building up in my head. I could even see the lines of her knickers through her tight fitting skirt. Thoughts rushed through my head, to get up off my chair, to walk over and touch her large bum. Thoughts raced fast as to what I should do. My hormones were telling me to do just that but my controlled state was telling me to stay seated. I even felt sweat build under my arms and between my legs. Suddenly, she had stood up slamming the fridge door. The moment was over. I felt relieved but disappointed. My sister had decided to give up the food hunt and go for a long relaxing bath. Her last words before leaving the kitchen were. “ Later bro ”! I watched her leave the kitchen as I let out a deep sigh of relief.

After I had gained control over my senses I did feel angry with myself at what I had considered to do, after all she is my sister. My actions, then could’ve ruined our brother sister relationship forever. A few minutes after my sister had gone upstairs I had gone to my bedroom with lots turning over in my head. I began to change from my uniform with thoughts of guilt.