"Hey, Nick! Did you ever fantasize about fucking someone in the ass?" Susan cooed in her son's ear as he lay on top of her, rubbing his cock across the slit of her pussy.
"Oh! How can you even ask that? You know I'd do anything to fuck that lovely ass of yours," Nick said, dipping his cock into her sopping wet hole, making his mother moan like a slut.
"Oh! Oh! Oh! You're so damn naughty!" Susan squealed. "So, are you going to fuck me in the ass or aren't you?"
Nick glanced in the direction of his sister, Elisabeth and her friend Amber, who were hiding under the diving board. He was terrified of what they would think if they saw him fucking his mother in the ass. Susan turned her head to see what he was looking at, but he pushed her back and kissed her roughly on the mouth to distract her.
"Come on, Mom. Let's do it in the bedroom. Just doing you in the ass will be kinky enough, we don't need to do it outside. At this rate you're going to turn me into a total slut."
His mother laughed and slapped him in on the ass.
"You're my boy-toy. You're going to fuck me anywhere I want to, any way I want to."
"Yes, ma'am," Nick replied reluctantly, realizing he would get no choice. He pulled his cock out of his mother's pussy and navigated it towards her ass.
He placed the head against her rosebud and began to push, trying desperately to remember to be gentle. But he needn't have bothered. His mother's ass seemed to reach out and swallow him whole. His cock buried itself inside of her so quickly that it was almost alarming. Nick began to pump himself in and out, completely forgetting about the less-than-innocent girls who were watching him. He was fucking his mother up the ass, for crying out loud! The muscles squeezed his cock completely differently then they did when he had fucked her in the pussy. It felt completely new to him.
Susan pressed her thumb against his anus, and he gasped.
"Where's the toy you had before?" she asked in a husky voice. "Are you hiding it from me, you naughty boy?"
"Oh, I must have left it with my clothing," Nick said. "I can only leave it in for so long."
His mother pushed her thumb into him, making him squirm, his cock moving back and forth in her ass.
Oh damn, how he was enjoying it! It was just so fucking dirty! His cock throbbed with passion, and with every single thrust he thought that he might come.
He was so distracted by the pleasure that he barely remembered the girls hiding underneath the diving board, and when he thought of them lying there, watching him with their innocent schoolgirl eyes, it acted to only make him hornier.
Damn, he was such a pervert, but he totally couldn't help it. Sex was so much fun. Wasn't this the reason why he had started masturbating in the first place, despite the guilt he always felt afterwards? And damn, fucking his mom was so much more fun than any of the naughty little fantasies he had had while he was pumping his cock in his hand!
He loved the feel of his balls smacking against his mother's ass as he fucked her. He loved the way she moaned like a cheap whore as he thrust in and out of her ass. He loved the feel of her skin, her smell. Every little detail was making his cock throb on the verge of climax. Oh, it was so damn hot!
He slowly became aware of Elisabeth creeping out of the pool naked, and his heart gave a little shock. He had to completely stop moving in his mother's ass for a moment to keep from coming as the intoxicating combination of apprehension and lust coursed though him.
Nick reached under himself to stroke his mother's soaking wet cunt, making her moan even more and completely soaking his hand with her juices. He nibbled on her shoulder blade in hope of distracting her from Elisabeth.
What the hell was his sister doing, getting out of the pool? Was she trying to get him in trouble? The bitch! He wanted to give her a good pounding with his cock for being such a pain in the neck. She was practically begging for it, the tease!
And her body was so incredibly hot. Oh! Her breasts were so perky, and her clean-shaven pussy was so young and tender looking, like a flower that was just beginning to bloom.
Just thinking about it made Nick lose control, and he spilled his seed deep into his mother's ass. He was a little embarrassed for coming so quickly, but he loved the way his mother's ass muscles milked his cock, just like her pussy did a few hours ago, and yet somehow completely differently.
Elisabeth stood in place, as though mesmerized by the hot sex that was happening right in front of her face. Her hand actually dipped down between her legs to pleasure herself. Damn!
Nick pushed his mother over and snaked his tongue into her sopping wet pussy, trying desperately to distract her from the naked Elisabeth only a couple of feet away, who was now all-out masturbating while she watched.
What the devil possessed Elisabeth to be so stupid and careless?
Nick began to lap at his mother's pussy as though his life depended on it, his heart racing desperately. With his mother's legs around his head, he couldn't see what Elisabeth was doing, and he could only pray that she recovered her wits enough to find another hiding spot.
Susan moaned and moaned, thrusting her hips into Nick's open mouth as he tickled her clit with his tongue. Juices ran down his throat, nearly making him choke, but he was afraid to stop. If his mother wasn't distracted, she'd turn around and see Elisabeth. And try though he might, Nick couldn't figure out a way to tell whether Elisabeth had left or not.
Nick tried to make wild arm gestures to ward Elisabeth away, because his jaw and tongue were becoming tired and he didn't know if he could keep pleasuring his mother so frantically for much longer.
"Susan, you little hussy," Nick heard his father laugh as he closed the sliding glass door behind him. "Don't you have any shame, using your own son as a plaything like that?"
"Well, someone was too busy with work to play with me, and I was still horny," his mother said, sulking like a little girl that has been denied ice cream.
Nick continued licking his mother's pussy even though he was pretty sure he was now safe. His father would have noticed Elisabeth if she hadn't hidden somewhere out of sight.
His father unexpectedly stuck a finger up Nick's butt, and Nick gasped into his mother's pussy, causing her to climax.
Samuel grabbed his wife by the hand and helped her stand up around Nick, who was lying on his belly on the sun chair.
"Now that I've helped your sex toy get you off, will you forgive me enough to go shopping?" Nick's father asked, kissing his wife's hand dramatically.
Nick stared at this open-mouthed, his face dripping with his mother's juices and his cock hard again.