"Why the fancy get up, mom?" Brad asked when he noticed the sleek red dress hanging on the doorframe of her bedroom door.
She poked her head out of her bathroom and called, "My baby boy only graduates from high school once and I want to make sure everyone knows how proud I am of you." Brad smiled to himself and went off to his own room to finish his preparations for his high school graduation party.
Lisa knew that what she had said was true but it was only part of the reason she choose that dress for tonight. She knew the red dress clung teasingly to her stomach and ass before hanging down and stopping just a few inches above her knee. She also knew the light fabric had a way of perfectly framing her tits that made them look very appealing while having just enough of a loose neckline that someone could see down her top and catch glimpses of her tits if they wanted to whenever she leaned over. Previously the dress had been reserved for special occasions with her husband when she knew that a good fuck would wait at the end of the night.
The truth was that she was extremely proud of her son Brad. He was her only child and she knew that his time growing up had been hard. Before they had finally settled in their current location almost two years ago Brad's dad had been in the military and had been forced to move around a lot. Moving became an almost yearly occurrence for the family and each time Brad had to leave behind his friends and start new someplace else.
One of the moves even caused him to be held out of school for a year for reasons he never fully understood. It had been something about the timing of his transfer and the transcripts from his old school not arriving until too late. The end result is that when he was about 11 he didn't go to school for the last two thirds of the school year and then had to repeat the grade he had started before the move. All this meant that he was now 19 for his high school graduation at a time when most of the others in his class were 18.
Lisa smiled at her reflection and knew that the real reason she had selected that particular red dress was something that she had never told anyone else, she had a crush on her son. She first noticed him in that way not too long after his 18th birthday over a year earlier. Her husband was gone on one of his many long business trips and she was feeling very lonely and particularly horny.
She had given Brad and some of his friends a ride to the local community pool. Usually she just dropped them off and left since the pool was so hot and crowded, but this time she decided to stay. She stayed away from Brad and his friends as she didn't want him to be embarrassed by his mom hanging around. She was swimming a few laps in the slow lane when she stopped to take a break. She looked over and was immediately drawn to the figure of a young man climbing out of the other side of the pool.
She watched his muscles flex and ripple as he easily pushed himself out of the pool and onto the deck. She stared at his ass as his wet suit clung to him closely. It was only after the object of her gaze turned around that she immediately recognized it was her own son. She quickly looked away in shame and disbelief.
After a while she began to look discreetly around the pool deck and she began to notice the hordes of high school aged boys lounging around or flirting shamelessly with the girls their own age. In particular, Lisa watched Brad's friends and felt her pussy tingling at the sight of their young, wet, hard bodies.
Lisa had long been drawn to younger men in her fantasies. She loved seeing herself in the role of the older, wiser teacher taking her young "student" in and teaching him how to be an accomplished lover. After that day at the pool she found herself regularly fantasizing about Brad's friends, the other young men she had seen at the pool, or sometimes about younger men she would see during the day. It seemed that being at the pool that day among all the 18 and 19 year olds in their wet bathing suits had enflamed her desires to new levels.
With her husband often out of town Lisa spent a lot of time taking care of her own pleasures. She had never cheated on her husband and didn't think she was the kind of woman that ever would, but she did have to admit that there were times when she wanted little more than the sexual attention of a man. There was only so much satisfaction she could get from her own fingers and her small array of sex toys.
A few weeks after the incident at the pool Lisa found that her fantasies began to change slightly. The first time her son's face popped into her fantasy she quickly fingered herself to a wild orgasm. Afterward she felt her stomach turn in a mixture of confusion and embarrassment over having even had the thought. Still, she did have to admit to herself that the day she eyed him wantonly at the pool before she knew it was him still stuck in her head.
For the rest of the summer Lisa made sure to stay with her son and his friends at the pool. She always stayed discreetly out of view but watched her son and his friends closely. More and more he reappeared in her fantasies despite Lisa telling herself over and over that it was perverted and wrong to feel that way. Over the next few visits to the pool she noticed that Brad had developed into a handsome and fit young man and, almost in spite of herself, her mind began envisioning her with him in decidedly unmotherly ways.
Lisa had always been quite horny and when her husband was home they used to fuck like newlyweds. When they were first married she dealt better with their time apart than she had been over the past several years. If anything she found herself growing more and more horny with him away and she knew that her feelings toward Brad were certainly the result of so much pent up lust.
Through his senior year in school she continued to fantasize secretly about him and his friends. Some of her wilder dreams involved Brad and two or three of his friends unleashing their natural 18 and 19 year old lust and curiosity on her willing body.
Aside from her deviant desires, Lisa was very proud of Brad and the man he had become. He was courteous and thoughtful and did very well in his classes. He kept himself quite busy with sports and his friends and Lisa enjoyed hanging out with him when she had the chance. One day it hit her that he was exactly the kind of guy that she would be instantly attracted to sexually if he wasn't her son.
As the months passed her secret affair that she had with her son only in her own mind blossomed and intensified. She no longer felt ashamed or odd at having these thoughts and would easily allow herself to contemplate all sorts of situations and varieties of ways to be with Brad.