Better safe than sorry

Phil looked down at his daughter's ass, and knew he couldn't risk knocking her up. "Fine," he growled, and he knew Alex heard this as a sign she would be let free. She started to move away from him again, and gasped as the tip of his wet cock pressed against her asshole.

"NO!" she gasped as she felt Phil press harder, his hands moving a bit so his thumbs could pull her ass cheeks apart, and then he thrust harder. At first, her ass refused to open, and his cock bent with his urgency. One hand left her hip to grip his cock, steadying it as he thrust forward, forcing its way into her ass.

She screamed as her dad thrust forward again, driving his cock deeper into her ass as his hand returned to her hip. Alex grunted in pain and humiliation as Phil grunted with lust and exertion, driving in and out of her ass as he fucked her fast and hard. He knew he wouldn't last long after being hard most of the day, and now being buried deep inside the tightest hole he had ever experienced. Even Claire hadn't been a virgin when they had sex for the first time, and even her ass hadn't been this tight the one time she allowed him to fuck her there the night he had proposed.

With a final, powerful thrust forward, one that made Alex collapse face first on the bed, Phil started cumming, filling his younger daughter's ass with hot semen. He held his hips tight against her ass, grinding his hips to maximize the sensation, then collapsed onto her back, pressing her against the bed. "You were wonderful," he whispered into her ear, "but we need to get you on the pill so I can fuck that cute pussy next time."

With a sob, Alex realized Phil wasn't done using her body any way he saw fit.