I had suspected that Kelly knew that I had been watching her when she got changed at night, I had always pretended to be asleep, and had never started to wank, until she put her light off. Watching her undress always got me hard, the fact that she was actually my big sister, and that it was morally wrong, never stopped me from getting excited. 

Kelly had started to change most nights in the bathroom after her shower, but suddenly she started to come back into the bedroom, where she would dry herself, before getting changed and going to bed. At this time I had no idea why she had started to do this, but would find out sooner rather than later.

It was in about May, when the weather was getting warmer, that I probably got my best viewing of Kelly. She had her shower, then came back into the bedroom. By now it was so light at night, that she did not have to put her light on, the light coming through the curtains allowed her to get dried and changed, it also allowed me to watch, but was dark enough for her not to be able to see me watching her, or so I thought anyway.

Kelly dried herself, then sat on the edge of her bed. I was so hard by now, I could not help but to start to wank. I tried to make it unobvious (is that a real word ?), as I could. She sat there drying her hair with the towel, totally naked, with her legs slightly apart. I could see everything, her boobs were bigger now, and it looked like she had shaped her pussy hair. 

By this time I was wanking quite hard, I tried to ensure that my cover was not moving too much. I tried to imagine what it would be like to touch her naked body. 

It was a warm night, as I saw her lie down, naked, it was too warm to wear anything in bed. Kelly did not even cover herself properly, I could see her boobs when she lay back, then I saw her caress them with one hand, her other hand reached between her legs. I thought I was going to cum, but slowed myself down as much as I could, I wanted this time to last as long as possible. My cock was so wet, I was soaking my covers, I wanted to cum so badly, but had no tissues that I could reach easily, well not without Kelly seeing what I was up to. 

I looked towards her, she was now lying on her side, I could see her boobs clearly, although I could not see her pussy, and she seemed to be breathing deeply. Her arms were still, and I was sure she was asleep. 

I thought to myself, get some tissues quickly, and finish myself off. I reached down to the side of my bed and grabbed a couple of sheets of kitchen roll, we could never afford tissues, and kitchen roll was better for absorbing cum anyway.

I pulled my cover to the side and started to wank my hard cock openly, Kelly was asleep after all, and her boobs looked great in the half light. I knew it would not take me long to cum, my balls were full, and she looked so HOT. I just hoped that the 2 sheets of kitchen roll would be enough to mop up my cum.

Kelly's light then came on, and I heard her say, you have watched me often enough, can I watch you? I mumbled ok, and she sat up. I could feel my cock get bigger at the thought. Kelly got up and walked to my bed, then sat on the edge of it, staring at my 8" throbbing cock. She asked if she could touch it, then I felt her fingers round it. She told me to touch her if I wanted to.

I reached towards her until I could feel her breast in my hand, she was wanking me slowly, she told me she wanted this time to last. She told me she had suspected that I had been watching her undress, and that it had excited her. She opened her legs a little, and told me to feel her down there, as I reached down I could feel how wet she was. My finger slipped into her pussy so easily, I wondered what it would be like to have my cock there. 

I knew I was about to cum, I think she could sense it to, as she started to wank me faster, soon I knew I was about to, and told her, she said nothing, but moved a little, and then I felt her tongue on my cock. I emptied my balls into her mouth, it was better than when Andy sucked me off, she drank it all, swallowing every drop.

Kelly told me she had been dreaming about getting a mouthful of cum for ages, but she had never thought the first load would have been her little brothers.

Kelly told me later, that she was still a virgin, at almost 18, and that Dad had started to make indecent suggestions to her. She told me that she did not want to lose her virginity to him, that she wanted to move out as soon as possible. I told her that I would miss her. Kelly then said, when I was 16, we could get a flat together. 

I would be 16 in about 6 weeks !!!!