Scarlet's cock twitched in delight at Emily's words, and she let out a long moan. "Fuck yeah sis!" she whispered back when their faces were closest together. "God, you are the sexiest little girl this side of Milky Way galaxy!"<br/><br/>She meant it, and a moment later she had her mouth back around her sister's nipple. Her tongue eagerly went to work, swirling around Emily's stiff nipple like Scarlet's life depended on it. It wasn't easy to hold on with all her heavy thrusting and the distracting sensations of Emily's cock and her mother's finger, but Scarlet managed it. Katherine was now going knuckles deep before pulling out again, and the sensation was pure delight for Scarlet. Her asshole was even more sensitive than she'd thought, and the way it gripped her mother's finger so involuntarily was sooo sexy!<br/><br/>And every time she went up far enough, Scarlet could feel her hit this special spot that would just send a jolt of pure pleasure into her cock. Scarlet had to think for a couple minutes (she had quite a few things on her mind after all) before she remembered something from anatomy class. Wasn't that her prostrate? She'd heard that it was supposed to feel good to massage that, and it had a lot to do with the creation of semen. Hell, she was beginning to love that little organ! Just by touching it, Katherine could make Scarlet moan and squirm in pure delight!<br/><br/>Finally pulling her mouth from Emily's tit, she grinned at her sister as she kept thrusting her hard shaft as deep as she could. It felt good to have Emily's legs wrapped around her like this. It made her feel...in control. On top. It was a good feeling, and Scarlet realized that maybe this was just her. She was the dominant partner. Scarlet mentally shrugged, putting that topic on the shelf for later. Meanwhile, she put her hands to her own breasts and pressed them together tightly around Emily's cock! It was sliding right between them with every thrust anyway, so Scarlet began giving Emily an impromptu tit-job as she fucked her.<br/><br/>"MMm, like that sis?" she giggled. She could feel the precum from her sister's cock smearing up her tits and making the shaft glide more easily between them. "I think I'll have to-OH FUCK!"<br/><br/>The last exclamation was due to Katherine rather suddenly inserting another finger into each girls asshole and increasing the tempo at which she thrust her digits in and out. Scarlet could feel her asshole clench down hard on her mother's fingers, and the sensation made her go wild. She could feel a powerful orgasm building once more, as her cock slid into Emily's glorious, tight pussy.<br/><br/>"Go faster Mom!" she whined, closing her eyes and thrusting as fast as she could. "Please go faster and deeper!" If one finger touching her prostrate had felt good, the combined pressure of two, and going faster, felt extraordinary. "Oh fuck...cum with me Emily! I'm gonna cum soon, and I want you to cum with me!"