Cassie stood at the precipice of her twin sister Sandra's bedroom, peering in through a crack in the door as Dean McCann held her sibling down, keeping her bent over the edge of the mattress. He pounded into her with powerful thrusts, the muscles in his ass contracting each time he drove his hips forward. She could hear the loud crack of Dean's thighs slapping against Sandra's bare ass, and it mixed harmoniously with the young redheaded woman's mewling, picking up in intensity as she grew ever closer to a climax.
Although Cassie could feel that the front of her panties were almost completely soaked through, she didn't dare risk touching herself while standing in the doorway. There was no telling how they might react if they heard her, and she didn't want them to halt their rigorous fucking. However, she did allow herself the slightest of pleasures as she tweaked her erect nipples through the thigh-length nightshirt she was wearing, biting her lip to prevent any noise from escaping her mouth.
Earlier that evening, Cassie and Sandra had gone out to the local club they frequented, which is where they ran into Dean. He had literally been the boy-next-door when they were growing up, but his parents had moved away after he went off to college, so they hadn't seen him in a long time. Dean had been a few grades above the twins back in high school, and when they were freshmen, they'd often spend their time after school watching him and the rest of the swim team practice.
Cassie had long harbored a crush on Dean, but Sandra was always apathetic about him. She preferred to go after football players, liking the bulky, muscular guys over the more slender and toned swimmers. If Cassie had been braver, she might've even gone through the entire team like her sister did for the football players. Unfortunately, she never got up the nerve to even approach him, let alone offer herself up as a team bonding exercise.
At the club that night, it was Sandra, not Cassie, who managed to catch Dean's eye. Despite being identical twins, Sandra always fared better when it came to boys. Part of that may have been their differences in apparel choices--Sandra usually wore something tight and skimpy, like the outfit she'd chosen to wear to the club.
It consisted of a short tan miniskirt that barely reached down past her ass, black plunging halter top showing off her bosom, a pair of fishnet stockings, and knee-high black high-heeled boots. Cassie, on the other hand, wore jeans, a loose-fitting t-shirt, and a pair of Uggs. Dean spotted the sisters first, weaving through the crowd to reach them.
"Cassie! Sandra!" he said loud enough for them to hear him over the cacophony of blaring bass, thumping drums, and chattering patrons. "Over here!"
The twins realized who he was and happily made their way to him. "Dean! I can't believe this! How are you?" Sandra asked.
"Pretty good," he replied. "You guys look amazing! Why don't you join me for a drink, so we can catch up. It's been ages since I've seen you."
Sandra cast a glance towards Cassie and shrugged. "Sure, why not?"
The three of them chatted about their lives since high school while throwing back shot after shot. Cassie, as usual, was being very quiet and shy, allowing her sister to do most of the talking. Therefore, it didn't come as much of a surprise when the increasingly intoxicated Dean soon zeroed in on Sandra, ignoring Cassie completely.
"Wanna dance?" he asked her.
"Okay, sure," Sandra answered. He got off his stool and offered her his hand. She stood up and took it, and he led her out onto the dance floor, leaving Cassie behind at the bar. Awkwardly, she twirled around in her seat, now all alone as she watched Sandra and Dean enter the frenzy of the rhythmic, pulsating mass of people using the music as an excuse to simulate getting intimate with one other.
There was a knot in Cassie's stomach as she watched her sister grinding against her longtime crush, undulating seductively, her limbs entwined with Dean's. Cassie could do nothing but look on enviously and continue to drink. At one point, she thought she saw Dean's hand beneath the front of Sandra's skirt, but with so many people dancing all around them, she couldn't be certain. By the time they returned to the bar, both of their skin was beaded with sweat, and they barely paid any attention to Cassie, instead devouring each other with their eyes.
When Sandra and Dean said they were ready to go, Cassie called for an Uber to pick them up outside the club. Dean was all over Sandra as they waited, standing behind her and wrapping his arms around her midsection as he peppered the side of her neck with kisses. When the car finally arrived, Sandra confusingly darted past Cassie, climbing into the backseat first, and leaving Cassie to get in after her. Dean entered last and pulled the car door closed.
Adding to Cassie's discomfort, Sandra decided that she didn't want to sit idly as their driver ferried them home. Since she had chosen not to sit in the middle, she leaned across Cassie so she could rub her hand over the bulge in Dean's pants. He was obviously very aroused by this, and ended up pulling out his cock, which Sandra proceeded to suck while stretched out over her sister until they arrived at the twins' apartment complex.
