SCI FI STORY

One day a foolish young rube named Maybrie left work and as he was headed homestead he was pulled by an electric blue beam into a spaceship. The otherworldlians aboard explained to him in soothing tones that he would come to their superiorly advanced world, and he would be a lavishly pampered specimen for their culture to admire. They also told of a life-sustaining salve they had developed that renders its users immortal. It looked like things were made for Maybrie, but he thought of living forever and missing his loved ones back home. So he stole into the salvekeep and he stole the salve and he stole an escape pod and returned home.
Long story short, he put the salve on his nethers and his seed was preserved until an in vitro fertilization 3,000 years later and his son killed the president .. . OF EARTH!!!