My Sexy Sister

When we were younger, my sister always touched my dick, every day was the same story, those were little touches, but i knew that was not accident. Until one day, when we were watching tv, and she put her legs on my leg, on my leg but almost touching my dick, while the tv show was getting along she moved her legs few times and touched my dick, i was so nervous and started to getting erection, my dick was getting bigger and bigger, and there were no space in my shorts, she saw that and started to touch it more, i continued to watch tv show, but her legs were so hot in tights, my dick were second away to explode, she noticed that, and asked my to show her my dick, i said that was inappropriet, but she continued to watch at my boner that was millimeter away from jumping up from shorts, i said okay you can see it, the moment she pulled my shorts my dick was bouncing, i didnt know that she was going to touch it, but she was surprised by my dick size and caught it by her right hand, and then came explosion, i came like newer before, she had very surprised look because it was first time for her to see dick and cum.
After that she saw it a few more times, and was sitting in my lap and felt my hard dick. All the time i know that is mistake but my dick always gets hard when she provokes me...