Mark Levine lay naked on his back. His wife, Loren, straddled his waist as she slipped his erect penis into her warm pussy. This is the first time they have had sex since she returned from a business trip last Saturday...the day that Mark had a sexual encounter with her little sister, Amy. In the past week, Mark had kept busy at his job at a car dealership, staying late even when he didn't have to. His only day off since the previous Saturday was on Wednesday, and he spent the day preparing for an anniversary party they were throwing for Loren's parents that upcoming Sunday. He didn't see much of his wife that week as he purposely avoided her. She was kept busy herself with her work and getting everything ready for the surprise party they were throwing in two days. She complained about not seeing Mark much that week, but was also used to his work keeping him busy. She noted that he seemed busier than usual, and wanted to surprise him with a romantic evening that Friday night.
"Oh, you feel so good honey," Loren purred as she ground her hips into her husband's. Loren knew that Mark had off that weekend, but they would be too busy preparing for the party on Saturday and hosting it Sunday to spend any intimate time together. "Oh yes baby," she lustfully moaned as she began bouncing on his hard dick.
Mark stared up at his wife as she impaled her pussy onto his engorged cock. At 28, she didn't look much different than the day he married her, almost 4 years ago. Her long blonde hair cascaded down her shoulders and over her 36-C breasts. Her nipples rose to her touch as she grabbed and rolled them between her fingers. Her flat stomach perfectly showed off the tattoo a few inches below her bellybutton: two sparrows flying towards one another, each with a leaf in it's mouth. She said it symbolized Mark and herself flying towards each other, each bringing a piece of what would become their home together. He watched her fat pussy swallowing his cock again and again as she bounced up and down. It was a gorgeous sight.
And yet, Mark couldn't stop himself from thinking about her sister, comparing their bodies. They were similar in a lot of ways; same hair color, same pretty face, similar breast sizes. But Mark couldn't help thinking that Amy's body was firmer than his wife's, probably a result of playing sports at the college she just graduated from and the fact that she was 6 years younger. His thoughts filled with the memory of her naked body as she stood in front of him. Her well-toned physique, those perky breasts, and that gorgeous pussy were burned into his mind. And those eyes. Her enchanting deep green eyes. His wife had blue eyes, also deep and beautiful, but Amy's luscious green eyes seemed to be burned into his very soul. He couldn't keep himself from thinking about them, and the rest of her, throughout the week. Her hot mouth sucking him dry as she knelt on the floor in front of him...the saliva and cum that flowed down her body, dripping off her tits. He thought about the stream of cum that dripped from her pussy as he ate her out, causing a wet spot on the couch beneath her. His mind swirled with thoughts of her smell, her body, and her touch. It consumed him.
As his wife fucked him harder and faster, her moans reminded him of the way Amy moaned when she came in his mouth. As he watched his dick glide in and out of his wife, slick with her juices, all he could think about was Amy's tight, young, wet pussy. He imagined his cock sliding in and out of it, the look of ecstasy in those green eyes as he banged her with all his might, her screams of pleasure as he brought her to orgasm.
"Oh fuck yeah!" Mark yelled as his cock exploded deep inside of his wife's pussy.
"Oh yeah baby," Loren moaned as she slipped off of him and laid her head on his chest. "I love you honey."
"I love you too," Mark quietly responded. She had no idea that his strong orgasm was caused by the thought of fucking her sister.
The next day, as Mark sat at the kitchen table across from his wife, he was racked with conflicting feelings. He felt guilty about cheating on his wife, no doubt, especially with her own sister. He loved Loren and he would never intentionally hurt her. The encounter with her sister was anything but intentional, yet the bigger problem was not just that it had happened, but the thoughts that had been filling his mind since it happened. The husband in him was filled with doubt and guilt. The man in him was filled with lust for that hot 22-year old body that had lain before him so willingly a week ago.
"So Amy said she stopped by last week," Loren said between bites of her bagel.
"Um what? No! I didn't see her," Mark blurted out, then silently chided himself for the aggressively defensive response.
"Yeah she said she just dropped off those punch bowels, let herself in with her key. She said you must've been upstairs when she came by," Loren remarked casually. She appeared unconcerned with his quick denial.
"Oh yeah...I must've been," Mark replied quietly, relieved that his lie reflected Amy's. How was he ever going to keep this up? He hadn't seen Amy since that day. He knew she would be at the party tomorrow, and he had no idea how he would respond to seeing her again...or how she would respond to him.
"She's coming by in a bit to help set up for the party. She says Mom and Dad have no clue about it. They think we're all going out to a quiet lunch!"
Mark's mind suddenly spun out of control. Amy, there, soon!? He would be alone with just her and his wife. He didn't think he could do it. Being in a large group with them would be hard enough, but being with just the two of them would be agony.
"Oh, um, didn't I tell you I have to work today?" Mark said apprehensively.
"What? No! Honey, we need to get ready for the party today! We need you to help! I thought you had the weekend off!" Loren exclaimed excitedly.
"Yeah, I know, but Bob told me yesterday that I'd have to come in today. Tom is sick or something. I thought I told you last night," Mark lied.
"Okay honey," Loren sighed resignedly, "if you have to go, you have to go. I guess Amy and I can manage without you."
"I'm sorry honey," Mark said as he rose from his seat and kissed her on the head. "I'm gonna go take a shower."