As Jeff sat down at his first class of the day, he felt a twitch in his dick. He was concerned for a moment but decided to ignore it and pay attention to the teacher. However, that would soon be something to worry about.
15 minutes into the class, he felt the need to adjust his shirt. "Why does my shirt feel tight?" He looked down at his torso and grew concerned. The changes began with his abs, it appeared as if he was growing a little belly. "What is going on?!" He grew upset. He raised his hand and asked to go to the bathroom before things became intense.
His stomach began to growl, as he walked to the bathroom. He opened the door and seemed to be empty. When he reached the mirror, the changes became a bit more noticeable. He looked at least 30 at this point. His stubble had grown to be a full beard. This shoulders were wider and his pecs were a bit softer. His little belly has grown to be a dad gut. He looked at the mirror and was strangely turned on by what he saw. The reflection kind of reminded him of his father, who he had always thought was attractive.
As the changes began to stop and his clothes had stretched, a familiar face entered the bathroom.
"Jeff?!" said the younger stronger man.
"Dad? What happened to you?"
His dad began to tell him the story of what had happened in Jeff's bedroom, and how he had no idea that change would affect both of them. However, as the story went on, Jeff's father noticed something odd. His dick was completely hard.
"Ummm. Dad, is someone a bit excited?" Jeff noticed that maybe the changes had made his father attracted to men. Jeff took this as the perfect opportunity. He approached his father and went in for a kiss. Tearing his clothes off, he immediately began to feel up his newly muscular father. Things became heated as they began passionately making out. His father began to rub up against Jeff's pants, noticing he was hard as well. Jeff, being the older more dominate one, turned his father over and began to fuck him in the ass. They both felt euphoria.
They both hopped in the shower in the locker room and continued to admire each other. Jeff loved how buff and hairy his father looked, and his dad loved how commanding his son had become.