The Summer Rental - Part 3

Click here to read the previous parts of the story.

It was the faint sound of a floorboard creaking that lured Christian from sleep. He felt a brief sense of anxiety at the notion of an intruder in the house, but a quick check of the bed revealed that Ruby wasn't sleeping next to him. Christian closed his eyes and prepared to let sleep once again envelop him, but his brain had other plans.

It took a few moments, but it eventually dawned on him that Ruby had slipped out of the bedroom for more than a quick visit to the bathroom. After all, Adam was in the house, and Ruby wasn't exactly capable of containing her desire for their brother-in-law. If anything, she tended to surrender to that desire whenever possible, as she'd done at Christian's parent's house time and again at Christmas.

Christian's eyes shot open and rolled onto his back. He waited for a few minutes to see if Ruby had, in fact, just gone to the bathroom. He didn't hear a toilet flush or a sink running, though. He didn't hear much of anything, which told him that Ruby had left the bedroom for something else.

Christian pulled the covers aside, threw on a t-shirt, and tiptoed towards the door. He turned the handle slowly and pulled back, hoping the door wouldn't squeak as it opened and give away the fact that he was in pursuit of a bit of kinky, voyeuristic pleasure.

Once he was in the hallway, Christian glanced towards Adam and Ruby's room to make sure the door was closed and that his sister was likely sound asleep. Then he turned his attention in the other direction and held his breath as he listened for any sign that Ruby was fooling around with another man. He heard nothing, but Christian needed to fully satisfy his curiosity, so he set off down the hallway.

Each step was slow and delicate, for Christian didn't want to trigger the same floorboard that had woken him up. If Ruby was fooling around with Adam, he didn't want them to know he was watching.

Christian made it to the stairs without making a sound. He grabbed the banister and he was about to head down when he heard a faint moan. It was a man's moan. It was Adam. Christian was right. His wife had snuck out of the bedroom to fuck her brother-in-law. Despite already having fucked him multiple times on their vacation, she needed more, a fact that Christian found hugely arousing, to the point that one faint moan was more than enough to bring his cock to a half hard state.

In pursuit of the kind of pleasure he'd come to crave more than any other, Christian descended the stairs. He did so slowly and deliberately in hopes of keeping silent, for Adam had no idea that Ruby wasn't cheating on her husband, that Christian was in on it, that he knew everything.

Once he'd reached the bottom of the stairs Christian turned towards the living room. The curtains were open and moonlight streamed through the windows, illuminating the figure sitting on the couch. It was Adam. Christian couldn't see Ruby, but he could hear the sound of a blowjob. She was on her knees between her brother-in-law's legs. She had his cock in her mouth for the second time that day.

"Fuck," Adam said before groaning.

Ruby's head popped up and Christian caught a glimpse of her smile before she said, "You have to stay quiet. I don't want to wake anyone up."

"It just feels so good," he replied in a whisper just loud enough for Christian to hear. "If you're nervous, though, we could stop. I'm sure we'll get a chance to be alone tomorrow."

"I can't wait that long," Ruby said. "You know I can't. You know when I'm around you...when we're together, I can't help myself. I'm turned on all the time. I feel this constant need to be with you, Adam."

"I feel it too," Adam replied before leaning forward. Christian couldn't really see, but he heard his wife and his brother-in-law kissing. He heard their quiet moans of passion and he heard Ruby's hand moving up and down Adam's slick cock.

Adam leaned back and Christian thought they might have sex, but Ruby's head disappeared once more and the sounds of a blowjob resumed. Adam moaned again, but of course he did. Ruby gave wondrous blowjobs and she seemed to put in extra effort when she went down on Adam, as if she was driven by a deep-seated desire to make him feel the most intense kind of pleasure.

"Ruby, if you keep doing that, I'm going to cum," Adam said softly.

Her head popped up once more and she stood. Christian saw his wife's naked body - he loved that she'd stripped for Adam - and she crawled into his lap. "You know I love to make you cum," she said. "But I want your cum inside me. I want you to cum in my pussy."

A moment later Ruby let out a low moan and closed her eyes. Adam was inside her. He must have been. The look on her face - which Christian could see thanks to the ambient light of the moon - was one of pure pleasure. It was the look of a woman who was about to have the sex she craved.

"You feel so good inside me," Ruby said as she looked down at Adam, took his head in her hands, and kissed him. Her body moved on top of his. She was riding him. Christian wished he had a better view, but what he witnessed from the bottom of the stairs was more than enough to leave his cock exceedingly stiff. He reached down to stroke it gently. There was no need for him to get too excited, as he was almost certain Ruby would offer him some sort of pleasure when she'd finished with Adam.

"Fuck, Adam, I love your cock," Ruby said. "I love how good you make me feel."

"Didn't you say we should be quiet?" he asked.

Ruby smiled and kissed him again. This time she seemed to lose herself in it, as the kiss went on, and on, and on. Their tongues danced and Adam's hands found their way to Ruby's breasts to play with her perky flesh and what Christian imagined were her rock hard nipples.

Christian wasn't sure how long they fucked. It seemed as if time moved slowly as he witnessed his wife gleefully riding his brother-in-law's cock. It was Ruby's passion that Christian focused on, though. She wasn't just grinding on another man's cock to give her clit the stimulation it needed for an orgasm. She was connected with Adam. She was enmeshed in their mutual sense of desire, in their immutable sexual chemistry. Christian had first observed it over their Christmas vacation and it clearly hadn't dissipated one iota.

"Cum inside me," Ruby said softly. "Please, Adam, I'm close. Cum inside me."

In that moment, Christian couldn't help but focus on the unquestionably thrilling notion that his brother-in-law was about to cum inside his wife. It brought with it an intense kind of pleasure, to the point that he had to stop stroking his cock for he feared he'd cum in his underwear.

Their mutual groans of pleasure soon followed and Christian studied his wife's face as she came on Adam's cock. He saw the pleasure, the joy, the deep sense of satisfaction their brother-in-law had just provided her.

Christian knew it was time to head back to the bedroom - he didn't want to get caught watching, after all - but he couldn't quite tear himself away from the sight of Ruby and Adam sharing long, tender kisses as their bodies remained joined on the couch. There was just something so intimate, beautiful, and even romantic about it. To witness such intimacy between his wife and brother-in-law brought Christian an unexpected level of pleasure, making him doubly desperate for his wife's return to their room.

Knowing it was unwise to stay any longer, Christian slowly ascended the stairs as Ruby and Adam enjoyed their post-coital kisses. He tiptoed down the hallway, gently opened the bedroom door, and closed it with the same level of care before crawling into the bed and staring up at the ceiling while his cock throbbed painfully and tempted him to reach into his underwear and masturbate.

Christian resisted the desire, though. Instead, he waited. He wasn't sure how much time passed - he didn't bother looking at his phone - but eventually the door opened and Christian kept his eyes closed just in case she and Adam had come upstairs together.

Ruby crawled into the bed, cuddled up next to him, and kissed his neck. Christian smiled as her hand moved down his stomach and into his underwear. She moaned softly and asked, "Did you enjoy watching?"

"How did you know?" Christian replied.

She kissed his neck again and said, "I could see you. You were right at the bottom of the stairs. I couldn't really see your face, but I knew it was you. Did I wake you up when I left the room?"

He nodded. "I heard the floorboard creak. It's an older house. I waited a little to see if you were just going to the bathroom, and when you didn't come back, I went downstairs."

Ruby sat up and took her camisole off, exposing the breasts that Adam had played with while she rode him. "Did you find what you were looking for?" she asked.

Christian pulled the covers aside and yanked his underwear off. His stiff cock sprang free and he reached up to pull Ruby's lips to his. Her tongue slipped into his mouth almost immediately and he thought of the tender kisses she'd shared with Adam both during and after the sex they'd had. He thought of his brother-in-law's cock inside Ruby while she indulged in her obvious passion for him. He felt precum dripping from the tip of his cock, precum that Ruby used to great effect when she took him in her hand and slowly stroked him.

"It was...I know this might sound weird, but it was beautiful watching you this time," Christian said. "It seemed so...so passionate."

Ruby straddled him and rubbed her panty-clad pussy over the tip of his stiff cock. "It was," she replied. "It's always passionate, actually, but this time felt particularly good. I'm not sure why. Maybe it was the riskiness of it. Maybe it was the fact that neither of us cared about the risk, that we were just so desperate to have each other again."

Christian ran his hands down his wife's back and grabbed her ass through the soft, thin material of her lace panties. "I love that you're desperate for him. I love that you were so desperate for him that you couldn't bear waiting until tomorrow to fuck him again, that you had to have him tonight."

"I did," Ruby said. "I had to have him. I heard him get up and go to the bathroom. That's why I got up. I met him in the hallway. We kissed, in fact. I told him I had to have him. I took him downstairs."

"And you ended up on your knees for him," Christian added.

Ruby smiled and moved back until she was kneeling between his legs. "I did," she said. "I love having him in my mouth. I love the way my lips stretch around his big cock. I love how hard the shaft is and how soft the head feels. I love sucking on it and seeing the look on his face. I love that I can get him to that place where he's genuinely desperate to fuck me."

Before Christian could say a word, Ruby took him in her mouth. She sucked his cock and he thought of her doing the same for Adam. He thought of her lips stretching around his brother-in-law's big cock. He thought of her tongue swirling around the head. He thought of her making Adam moan with pleasure and he did the same.

Ruby then kissed her way up Christian's stomach and chest before pulling her panties aside and rubbing her lips over the tip of his cock. "Do you want me?" she asked softly.

"More than any man has ever wanted his wife," Christian answered.

"Even though you just watched your brother-in-law fuck me? Even though you watched me ride his cock? Even though you watched him cum inside me?" Ruby asked with a smile. She was teasing him and she knew it, and it seemed to make her happy.

"Those are all the reasons I want you so badly," he said.

Ruby dropped down onto his cock, surrounding him with the heat and wetness of her cum-filled pussy. "Does that feel good?" she asked. "Does my pussy feel good even after Adam fucked me?"

"Your pussy has never felt better," Christian answered. "I love fucking you after you've been with him, Ruby. I love it."

She put her hands on his chest and rocked her hips back and forth, slowly milking his stiff cock. Christian was grateful for her lack of speed, for he almost certainly would have cum quickly if she'd ridden him with great vigor.

Ruby leaned down to kiss him. Their tongues entwined sensually as they indulged in slow, beautiful sex. His hands moved all over her body and he moaned into her mouth, for the pleasure of being inside her was far too significant for Christian to stay quiet.

Spurred on by a desire to be on top, Christian deftly flipped Ruby onto her back and slipped his cock inside her once more. She smiled, wrapped her legs around him, and slipped her tongue into his mouth. Christian couldn't help but fuck his wife with wild abandon. The sounds of sex got sloppier and louder as it seemed that some of Adam's cum was leaking out of her while they fucked.

"You like that his cum is still inside me, don't you?" she asked. "You like fucking me when Adam's cum is still deep in my pussy, don't you?"

"Yes," Christian admitted. "You know I do. You know it turns me on to fuck you after he's had you."

"Mmm, baby, it turns me on too," Ruby replied. "Now I want you to cum inside me. I want you to have the orgasm you deserve after your naughty little voyeuristic experience."

Christian couldn't help but fuck her harder. He thought of the way Ruby had ridden Adam, of how they'd kissed. He thought of the obvious passion between his wife and her brother-in-law and it sent a potent wave of desire through his body. He buried his cock inside her and did everything he could to limit the volume of the grunts and groans that were so eager to escape his lips while cumming inside her.

"Oh, fuck, Christian, cum inside me," Ruby said as she held him close. Her voice quivered as she added, "I'm cumming. Christian, baby, I'm cumming!"

Christian emptied every last bit of his desire into Ruby and kissed her neck as he listened to her come down from her second orgasm in just a short span of time. His lips eventually found their way to hers and they too shared soft, sensual kisses, just like she'd done with Adam.

"I'm a lucky woman," Ruby said.

"Oh yeah?" Christian asked.

She smiled. "Absolutely. I get to spend my vacation fucking you and Adam. I get to have the best sex of my life with two men I care deeply about. I get to have the cum of those two men inside me, too, which brings me more pleasure than I would have thought."

"Me too," Christian said.

Ruby caressed his face, kissed him softly, and added, "I love you, Christian."

"I love you too," he replied.

He pulled out and Ruby quickly pulled her panties back over her pussy, seemingly content to let the cum of two men rest inside her. Christian rolled onto his back and she cuddled up next to him, running her fingers over his chest and kissing him softly a handful of times before he closed his eyes.

Sleep overtook him quickly, though right before he surrendered to it, Christian heard what he thought was a moan. A distinctly feminine moan, and it wasn't coming from Ruby. It must have been Marie. That was all the thinking Christian did about it, though, for he was suddenly quite exhausted and sleep washed over him, emptying his mind and pulling him into a restful state.