Oakley’s mind was swirling with distractions as she stepped through the kitchen entry at the lakehouse. She kept replaying the events from earlier with her sister. The feeling of Zoe’s lips pressed against hers. The way their tongues played as they kissed. The taste of her pussy as she went down on her. It was so sensual, so perfect. For a minute the girl found herself wondering why they’d separated at all. Why had she parted ways with her sexy, fuckable sister when they could have just stayed there in the boat, having fun out on the lake?

Doing her best to corral her thoughts, Oakley shook her head. “Keep it together,” she told herself. She was there to find Mom and tell her that something was going on. There’s some reason that she, Zoe, and Dad all seemed to be struggling with desires. Maybe if she found Mom while Zoe found Dad, one of them could help solve this. Or maybe one of them could help her come. That’s what Oakley really needed, to come again. Maybe her father would even fuck her with that big cock she felt back on the boat. That would really help.

Shaking her head once more, Oakley took a deep breath and then called out. “Mom! Will! Anyone here?”

When there was no answer, Oakley started looking around. Nobody was in the kitchen, and the living room and dining room were both empty as well. Next, she headed down the hallway to the bedrooms.

That was when she heard something.

The sound had been soft but had a distinctive tone. It was almost like a moan, but more muffled. When Oakley heard it again, she followed the source of the noise straight to her parents’ bedroom door.

For a minute, she just stood there, listening to the sounds coming from the other side of the door. There were more muffled moans that sounded like they were coming from her mom. There was a male grunting noise, too, along with a rhythmic slapping sound. When she realized what she was hearing, she gasped. It sounded like her mom was getting fucked.

Before she could even consider what she was doing, Oakley was reaching down for the doorknob. She turned it slowly, opening the door just enough so she could see the bed. As soon as she saw what was happening, her jaw dropped.

There on her parents’ bed, Patricia was naked, save for a collar around her neck. She was completely spread out, her limbs tied to the bedposts, and there was a gag in her mouth. On top of her, Will was mercilessly slamming into her, his cock disappearing between his mother’s legs again and again as he grunted and thrust. In one of his hands was the end of a leash that was attached to their mother’s collar.

“Oh, fuck, Mom, you slut,” Will growled as he pummeled his mom’s pussy. “You love this, don’t you? You love being tied up and used by your son’s big cock?”

“Mmph hmph,” was all that Patricia could groan out through her gag as she thrashed against her restraints in pleasure.

For what could have been forever, Oakley just stared at the scene before her, part of her in shock and part of her experiencing a surge of arousal. Her mom looked so slutty all tied up like that. The way Will was hammering into her made it clear that this wasn’t his first time fucking her, either. Despite the small voice in her mind crying out how wrong this was, Oakley found her pussy growing wet, and she couldn’t help but crave what her mother and Will had found in each other.

It didn’t take too much longer for Patricia’s muffled groans and moans to grow louder and louder. Will reached down, groping her tits as he slammed his hips into hers. Soon, Patricia was thrashing her head and bucking up against her son as she screamed into her gag, obviously experiencing a massive orgasm.

Oakley was mesmerized as she watched her mom convulse and squirm under Will’s body. She was so lost in the moment that she didn’t hear the four-wheelers approaching the lakehouse. She didn’t hear the door opening either, nor the sound of footsteps coming down the hall. As Will finally grunted and slammed into his mother, pumping her full of his seed, Oakley was so entranced by the sight that she didn’t realize she was no longer alone until she felt a hand come down on her shoulder.

As soon as she felt the contact, Oakley cried out and spun around, coming face-to-face with her father, with Zoe standing just behind him. Her shriek also got the attention of Patricia and Will, who were now looking in his direction as well.

John’s eyes shifted from his daughter to his bed, where Will’s cock was still buried inside his mother. “I think we all need to sit down and talk,” he said in a firm tone.

Less than ten minutes later, everyone was assembled back in the living room. Will had slipped into his shorts, and Patricia sat next to him on the loveseat, wearing her bathrobe. John sat at the end of the sofa, with Oakley next to him and Zoe seated next to her.

John looked around the room at his family. “Guys, what the hell is happening to us?”

“I—I honestly don’t know,” Patricia replied, her hand resting on Will’s thigh. “I mean, part of me knows this is wrong, but it’s like I’m addicted. I can’t help myself.”

“I know,” John replied, looking at Zoe. “I’ve felt like that too. But this isn’t normal. We weren’t screwing our kids before we came up here. Or at least I wasn’t.”

“I wasn’t either,” Patricia replied. “It started shortly after we arrived.”

“There must be something here, making us act like this,” John said.

“So, what do we do?” Zoe asked. “Can we call someone for help?”

“How?” Will asked. “There’s no phone service.”

“Well,” John said. “Should we leave?”

Everyone exchanged uncertain glances.

“I don’t want to leave,” Zoe chimed in, looking at her father. “I liked what we did, Dad. When you were inside of me, it just—God, I’m getting turned on just thinking about it.”

“I want that, too,” Oakley added. “Fuck, I want it so bad.”

“It seems that the damage is already done, dear,” Patricia suggested. “Maybe we should just enjoy it.”

John glanced at his daughters. They were so sexy. He’d already fucked Zoe, and part of him wanted to fuck Oakley, too. Still, he couldn’t shake the feeling that this situation was all wrong. He tried to argue again, but Will interrupted him, standing up.

“You can do what you want, Dad,” he said, “but I’ve just spent an entire week nailing my MILF of a mother, and I’m not going back now. Come on, Mom, let’s go to your room. I want to bend you over the bed and fuck you from behind.”

Will took his mom’s hand, and she rose to her feet, giving John an apologetic glance as she turned to follow Will down the hall. John watched them disappear into the bedroom before turning his eyes to Oakley and then to Zoe.

“So, that’s it?” John asked. “We’re just giving in to whatever this is?”

Oakley couldn’t take it any longer. “Maybe I want to give in, Daddy,” she purred, swinging her hips around to straddle her father. “You know, I’m the only one here who hasn’t been fucked by a nice, big cock yet, and I want that to change right now.”

John felt the last of his resolve crumbling as he looked into his daughter’s eyes. Reaching out, he took hold of Oakley’s hips, drawing her closer. As she moved, the teen leaned forward, closing her eyes and pressing her lips against his.

“Fuck, that’s hot,” Zoe whimpered as she watched her sister begin earnestly making out with her dad. Her fingers slipped under her bikini bottom, and she slowly began stroking her pussy as John wrapped his arms around Oakley.

Soon, John and Oakley were making out in earnest, their tongues dancing passionately as they moaned into each other’s mouths. John’s cock strained his shorts as his daughter ground her hips against him. His fingers found the tie on her top, loosening it and freeing the girl’s tits. John’s urge to fuck again was rapidly growing, and he knew he’d soon be inside Oakley.

Breaking off the kiss, John growled, “Your room, now.” Turning to Zoe, he added, “both of you.”

In a heartbeat the girls were up and racing to their room, casting off the last bits of their bikinis as they did. John rose from the couch, pulling his shirt up and over his head as he followed behind them. Rounding the corner into the girls’ room, he slipped out of his shorts, freeing his cock.

On the girls’ bed, Oakley and Zoe had begun making out. Stepping up to the bed, John took Oakley by the chin and pulled her away from her sister, pressing his lips into hers once more. Oakley groaned as he climbed into the bed, positioning himself on top of her.

“Is this what you want?” John growled, breaking off their kiss and grinding his cock up against her swollen pussy lips. “Do you want your daddy to fuck your slutty little pussy just like I fucked your sister?”

“Oh, fuck, yes,” Oakley groaned. “Please, Daddy, fuck me.”

John lined himself up at his daughter’s entrance. With a little grunt, he slipped inside, filling her in one long, slow stroke. Beside them in the bed, Zoe fingered herself as she watched her father’s cock slip inch-by-inch inside her sister.

“Oh, fuck,” Oakley groaned as he bottomed out. “Yes, Dad, that’s so good.”

“I haven’t even started,” John groaned. He pulled back until he was just barely inside her, then thrust down swiftly, eliciting a yelp of pleasure from his daughter. That thrust was followed by another, and then another. Soon, John was pumping into his daughter rapidly, plunging into her depths as the sounds of flesh slapping echoed in the room.

As they fucked, Oakley turned her head toward Zoe, who leaned in, pressing her lips into her sister’s in a scorching hot kiss. Oakley groaned into Zoe’s mouth as her father continued slamming into her. Zoe reached out, grabbing one of Oakley’s tits, only driving the girl further into her depraved pleasure.

“Oh, God,” John moaned, pumping into Oakley faster and harder. “I’m getting close, baby girl. Oh, fuck.”

Oakley groaned, feeling her father’s pumping becoming more frenzied and erratic. With each thrust, Oakley’s own arousal only continued to grow. She wanted more. She wanted to feel her father’s cum inside her. She wanted to feel him fill her up completely.

Just then, John buried his hips against Oakley, letting out a long groan as he shot rope after rope of cum deep inside the girl. Oakley groaned into Zoe’s mouth, more turned on than she’d ever been in her life.

Breaking off their kiss, Zoe turned her eyes up to her father. “My turn,” she purred. As John pulled himself off Oakley, she shifted her body in bed, taking her father’s place between Oakley’s legs. Almost at once, her lips found Oakley’s pussy, her tongue extending to taste the cum oozing from her sister’s slit.

Zoe quickly began lapping at her sister, licking her pussy as her fingers began working Oakley’s clit. Oakley groaned out, enjoying the sensation of her sister eating her out. Zoe’s free hand reached up, grabbing at Oakley’s tits.

“Oh, Zoe,” Oakley groaned. “Yes, eat me. Oh, God, that feels so good.”

Soon, Oakley was writhing in pleasure under Zoe, crying that she was getting close to coming. Zoe kept up her efforts, eating her sister with a level of skill that she didn’t know she had. A minute later, Oakley cried out, her body convulsing as she shook in orgasm. Zoe climbed on top of her sister, and the two passionately made out as Oakley came down from her orgasm.

Over the next two weeks, John fucked his daughters so many times that he lost count. At the same time, Will and his mother became almost inseparable. Nights were filled with cries of pleasure, and days were littered with fucking all over the property. When the day to return home finally came, everyone reluctantly helped clean up and returned to their cars. They knew their newfound lust for each other wouldn’t end here. They would bring it home with them and continue fucking each other all throughout the year. Still, there was a general feeling of sadness about leaving the place that brought them all together. Their only solace was knowing that they’d be back the following summer for another family vacation at the lakehouse.