Jason Eriksen walked into his house closely followed by his mother, and his aunt. They were returning from his birthday dinner, but this one was special because he had just turned 18. As they each found a place to sit, Jason said "Thanks again. Dinner with you two is always very special." With nods of agreement from the women, Jason sat back, wondering what would happen next.
His mother, Dianne, looked at him and said, "So, are you ready for your surprise?"
"You bet," he answered.
"Well," Dianne went on, "You know what you have to do." This was part of the routine that preceded Jason's gift, namely, a birthday spanking. Now this was not a spanking to hurt him, it was more of a slap session to commemorate each year that he'd lived. So, Jason stood up and walked toward his mother, who was sitting on the couch.
Just as he was about to kneel down, to lean on her lap, Dianne stopped him and said, "Since this is your 18th birthday, Aunt Lisa and I have planned an extra special surprise for you." She went on, "This means that you're going to have to trust us a little more than last year, but if you do, you're in for an extra treat."
Jason replied, "I'm ready for anything."
With that, Dianne stood up and began unbuttoning Jason's shirt. As she slid Jason's shirt off, she smiled, and sat down again. Then she continued by unbuttoning his pants, pulling down the zipper, and lowering his pants. Sensing his unease, Dianne looked up at him and said, "Don't worry baby, it's a really good surprise."
Somewhat reluctantly, Jason allowed her to continue by stepping out of his pants. There was a quick intake of air on Jason's part when his mother reached for his shorts, but again she looked at him, winked this time, and quickly pulled them down too. Not knowing what else to do, Jason then stepped out of his shorts.
Now standing completely naked in front of his mother and aunt, Jason waited for his next instruction. It was just a few moments, then his mother slightly tapped her thighs, indicating that he should assume the position. He then knelt down, and lay across her lap. Shortly after this, the spanking began. As with previous years, this wasn't much more that slaps divided between his ass cheeks. Unlike past years, it was affecting him in a more pronounced fashion. As his mother spanked him, his body jostled around, causing friction between her dress, and his penis. This was very pleasurable for Jason, and he was almost sorry when it was done.
"Eighteen," his mother concluded, before helping him up. He rubbed his ass just a little, because it did sting just a touch. At this precise moment, Jason became aware that both his mother and his aunt were paying attention to his half-swollen penis.
Aunt Lisa said, "Come over here for just a minute." While he moved toward her, she casually removed the flipflop from her left foot. "Well, big boy," Lisa said, "I've always suspected that you've had this reaction in the past, but now I get to see it first hand." She then hit his penis with the flipflop and watched it swing back and forth. When it stopped, she hit it again.
As the penis slaps went on, she grinned as it continued to grow. Jason slightly moaned each time he was slapped, but at the same time there was a certain perverse grin on his face.
Finally, she stopped, and asked him, "Are you ready for your big surprise?"
Words caught in Jason's throat; all he could do was nod his head. So both Aunt Lisa and his mother stood up, and led him toward the den. Jason had never been led this way before. His aunt was on his left, and she was holding his penis in her right hand. His mother was on his right, and had casually put her left hand on his right butt cheek so that the tips of fingers caressed the valley where his cheeks met.
What got Jason's attention when they reached the den was not the big "Happy Birthday Jason" sign on the wall, but it was that basically everything in the den was now covered with white plastic. He couldn't believe his eyes; the couch, the desk, the chairs, the entire floor, were covered in white plastic. Not knowing what to think, he allowed his mother and Aunt Lisa to lead him to the couch where they had him sit.
"It's now time for your big surprise," Lisa said to him. Then she took his mother's hand, and together they took a few steps away from Jason.
Both women turned to look at each other, and then, to Jason's astonishment, they began undressing each other. They started with their blouses, then skirts, followed by bras, and panties. As each garment was removed, they were tossed out the doorway, so that after a few short minutes, both women were as naked as he was. As he looked at the two of them, he was able to confirm that they really were identical twins. His mother's hair was longer, and straighter, while his aunt's was curlier, but other than that, they were identical. Their hips were the same, their breasts were the same, and their pussy hair was even trimmed in the same fashion.
"Let's get this party started," his mother said. With that, she reached for her sister's neck with her right hand, pulled her close, and then planted one of the most erotic kisses on her that Jason had ever seen. He could actually see both of their tongues reach out of their mouths, almost like to small shaking hands. They each giggled before continuing with the kiss, which quickly became very urgent for each of them. They clung to each other, squishing their breasts together for many long moments. Jason had always thought that his mother and aunt were close, but this was now confirmed in a way he never expected.
Eventually, they untangle themselves, and return their attention to Jason. "My, how your son's cock has grown since last I saw it," Lisa said.
His mother went on, "We didn't bake you a cake this year, we thought that it would be better if you helped decorate one of us."
"Sounds good to me," Jason said, "I'd like to do Aunt Lisa."
Lisa grinned at him and said "Let's get going."
She went to the covered desk, and lay down on her back. As Jason got to the desk, he saw that a cooler was next to it. His mother seeing this said, "We put the decoration supplies in the cooler."