With her hand still gripping the base of Robert's erection, she was able to keep him from thrusting himself even farther into her mouth-something that told her she was getting things right. As she continued to recall different bits of conversation she'd overheard, she began applying the details from them: using her tongue at different places and in different ways on her brother's manhood, changing the gentle suction she was applying in different ways, and even starting to slowly bob her head on him.

Having his sister's warm, wet mouth surrounding half his dick had left Robert stunned at how good it felt. When she'd started to suck on him, the desire to feel even more of the sensation was more than he could deal with; it was only the realization that it was Carla's hand around the base of his cock holding him back kept him from trying harder to stuff himself into the delightful confines of her mouth. Then when she started doing things to him, too… he knew that there wasn't a damn thing he could do to keep from climaxing in her mouth; all he could do was try to put it off for as long as possible. That met with only marginal success, and when she started moving her head on him in addition to everything else it was simply too much for him to bear. He knew she couldn't have shifted her head back and forth a dozen times before he felt his balls start to pull up; a couple more times of her lips sliding up and down his shaft, and he erupted.

From the way Robert was acting, Carla knew something was going to happen, but she wasn't prepared in the slightest when his cock suddenly filled her mouth with his juice. Although she was startled by it, she had enough presence of mind to keep going while quickly evaluating the semen he kept squirting.