Suzie had been divorced for a few years. Its was tough being a single mom but her son Tom was 20 now and the "mother thing" was pretty much behind her. The "sex thing" was difficult without a hard cock readily handy, but she made do with her vibrator often thinking of Tom's cock.
Tom was growing up to be a tall lean good looking boy. He was a sophomore at the local college and was on the swim team. He had a swimmers body.
Suzie liked going to the swim meets. The Speedos made every boy look like he had a perpetual boner. They were so small and tight it left nothing to the imagination. Watching Tom at the swim meets in his tiny skin tight Speedo got Suzie so horny she had to give her clit a rub while driving home from the meets.
She always made sure her vibrator was plugged in and charging before leaving for the meets. After every meet she would run the batteries dry cumming while dreaming of her son's cock in his tight Speedo wishing it was sliding into her pussy.
After one meet Susie was in her bedroom going at it when Tom suddenly walked in on her. He said he heard noises from her room when he was walking down the hallway. There was no doubt he heard noises.
She was still wearing her panties and bra so thought she could get away with surreptitiously sliding the vibrator under the covers and mumbling something about "stretching."
At breakfast the next morning Tom didn't mention a word about what he had seen the night before.
The following Friday as Tom was getting to leave for his swim meet he stopped Suzie in the kitchen and asked her if he could watch her masturbate when he got home from the meet.