Shocked by what he believed was happening, Brad still did not stop Katrina.   Something inside of him wanted to see how this developed.<br/><br/>"Up her ass, god he had never done that with anyone and here Kat was letting Dad fuck her ass, fuck her and who knows what else.   The raspy husky laugh in the darkened room along with the feel of her hand wrapped around his now erect cock killed all sense of morality that he had.<br/><br/>Knowing it was so wrong to pretend he was his Dad, and even more so to be pretending it with his sister, Brad kissed her neck and moved downward, kissing her skin.   In the darkness, her skin felt like silk to his lips.   Reaching her perky breasts and feeling her nipples, now hard on his lips drove him to madness.    This was his sister, the girl he played with , the girl he joked with and he realized that he had suppressed a deep desire to have her.<br/><br/>Moaning softly as he sucked her nipples, Brad let his hands wander over her almost perfect body.<br/><br/>