Kristi was only making small thrusts back against him even as she dropped to lay down on her twin. It was too much for him to handle though, he needed to feel her pounding against him. He doesn't wait much longer before starting to match her thrusts with his own, quickly taking over. He starts to draw his cock almost all of the way out before slamming it back in, slapping against her body. His hand rubs over her ass and over her puckered rear passage, testing her comfort level in those regards, all the while maintaining a steady pace as he pounds into his daughter.