Kate and Lauren stood before the massive double-ended dildo, its sheer size intimidating even their now experienced eyes. The silicone surface gleamed under the soft light of the living room, each end tapered to a point that seemed almost cruel in its perfection.

In the selection for this round of their perverse contest Kate and her daughter had both selected the largest dildo in front of them.

"We'll have to share" said Kate, excited about sharing this monster with her daughter. "Otherwise it's the same rules, first one to cum wins."

"Ok" said Lauren, her eyes looking at her mom's used pussy, her own pussy, sore from the previous penetrations was still beginning to drip with anticipation.

"Ready?" Kate asked, her voice trembling with excitement.

Lauren nodded, her hands shaking as she reached out to grip the dildo.

They positioned themselves on the ground, legs spread wide. The dildo lay between them. Kate took a deep breath, her fingers curling around the smooth surface. She positioned the huge monster at the entrance to her gaping pussy. She glanced at Lauren, who mirrored her actions, their eyes locking for a moment before they both began to push.

The initial insertion was slow, agonizingly so. Each inch felt like an eternity as their bodies resisted the intrusion. Kate's face contorted with effort, her muscles straining to accommodate the immense size. She could feel the stretch, the burn, but there was also a perverse pleasure in the pain. She bit her lip, trying to focus on the sensation rather than the discomfort.

Lauren was no better off. Her eyes were clenched shut, her teeth gritted as she pushed. The dildo seemed to mock her, every inch a battle. But she could hear her mother's labored breathing, see the determination in her eyes, and it spurred her on. She wouldn't give up, not now, not when they were so close.

"Come on, Lauren," Kate panted, her voice a mix of encouragement and desperation. "We can do this."

Lauren opened her eyes, meeting her mother's gaze. "Oh Mom. I'm trying."

With a final, concerted effort, Kate managed to get the dildo past the initial resistance. She gasped, her body trembling with the exertion. The sensation was overwhelming, but she didn't stop. Instead, she grabbed Laurens legs and pulled her body closer to Lauren, pressing the dildo further into her daughter's waiting pussy.

Lauren cried out, the sensation nearly too much to bear. But she felt her mother's hands,pulling her closer, and it gave her the longing to continue. She pushed, her body yielding to the pressure, the dildo slowly sliding deeper.

"That's it," Kate whispered, her voice hoarse with effort. "Just a little more sweety."

Lauren nodded, her vision blurring with tears of pain and pleasure. She could feel the dildo pressing against her cervix, the sensation both terrifying and exhilarating. She looked at her mother, saw the same look of determination, and her pussy yielded.

Finally, with a shuddering breath, Lauren felt the dildo fully inserted. She collapsed slightly, her body trembling with the exertion.

"We did it," Kate murmured, her voice filled with awe. "We actually did it."

Lauren laughed, a shaky sound that quickly turned into a moan as she adjusted to the sensation. "Oh fuck, Mom."

Kate smiled, her eyes shining with pride and something else, something darker. "Now fuck me."

They began to grind against the dildo, their movements slow and deliberate. Each thrust sent waves of pleasure through them, the sensation amplified by their proximity. Kate could feel Lauren's pussy lips brushing against hers, the contact sending shivers down her spine.

"Fuck, Lauren," Kate gasped, her voice thick with desire. "You feel so good."

Lauren moaned in response, her hips moving in sync with her mother's. "Mom, you're... you're amazing."

Kate's mind raced with emotions as she watched Lauren's desperate face. The thought of fucking the daughter she had raised, the one she had loved and nurtured, sent a surge of heat through her. The taboo nature of their act only intensified the pleasure, making every thrust more electrifying.

"Fuck me, Mom," Lauren gasped, her hips bucking against Kate's. "Harder, please!"

Kate's resolve hardened. She gripped Lauren's hips, her nails digging into the soft flesh, and began to thrust with a ferocity that left them both breathless. The dildo pounded into them, the force of their movements creating a rhythm that echoed through the room.

"You're mine, Lauren," Kate panted, her voice thick with desire. "All mine."

Lauren's eyes fluttered closed, her body arching as she took every inch of the dildo. She could feel her mother's love, her passion, and it drove her wild. She needed to cum, needed to feel that release, and she knew her mother was the only one who could give it to her.

"Fuck me mom, fuck me hard!" Gasped Lauren.

Kate's heart raced, the words igniting a fire within her. She increased the pace, her hips thrusting harder, faster. The dildo slid deeper, the sensation almost unbearable. She could feel her orgasm building, the tension coiling tighter and tighter.

"Look at me, Lauren," Kate commanded, her voice rough with need. "Watch me cum."

Lauren obeyed, her eyes wide as she watched her mother's face contort with pleasure. Mother and daughter staring at each other, mercilessly fucking each other. Kate's body trembled, her breath coming in short, sharp gasps. She could feel the pressure building, the wave cresting, and with a cry that mingled with Lauren's own soft gasps, she reached her peak.

Her body convulsed with the force of her orgasm, her muscles clenching around the dildo. She collapsed slightly, her eyes never leaving Lauren's. "Oh god, Lauren," she moaned, her voice raw with emotion. "You did it. You made me cum."

Lauren felt a surge of both arousal and anxiety, the sight of her mother's orgasm pushing her over the edge. She began to tremble, her body responding to the intense sensations. Kate, sensing her daughter's impending release, continued grinding the dildo into her daughter. " Cum baby, cum for mommy, be Mommy's little slut!"

Lauren's body began to yield, the tension giving way to waves of pleasure. Kate's eyes never left her daughter's face, watching as Lauren's expression shifted to ecstasy.

Lauren, encouraged by her mother and the overwhelming sensations, finally surrendered to her orgasm, her body trembling with the force of it. Kate watching as her daughters pussy convulsed around the dildo.

Finally Lauren collapsed to the ground. Both mother and daughter were exhausted.

"Oh fuck, you're the best daughter a mom could want." Kate breathed.

"I couldn't have done that without you," Lauren whispered.

Kate smiled, her hand stroking Lauren's hair. "Neither could I, baby."

Kate smiled deviously, "and now I won our challenge"

To be continued.