My sister is sleeping with her ass exposed and she doesn't wake up at all! I touch her just for fun and then I can't help but start stroking her ass! Then I cum instantly because it feels so good! ! When I try to insert it in my sleeping back, she wakes up and finds out, but she gets excited and says "I guess I can't help it, I'll just rub it..." and I let her jerk me off, but I can't hold back and I insert it! ! My sister panics and I can't help but cum inside her because it feels so good! I cum inside her three times in her sleeping back! !