Jeff was looking through the options when he spotted something that caught his eye - becoming his father's penis. He was curious about what it was like to be a penis, and this would be a great opportunity especially because he would be part of his father.
Jeff looked through the options. His father's dick was only 2 inches flaccid, which was, in Jeff's opinion, too short. He changed the value from 2 inches to 6 inches. He looked at the circumcision setting and found that it was set at Circumcised. He shifted it over to Uncircumcised.
Because his father would only be coming home at night, Jeff delayed the change by 6 hours so that the change would start when his father was at home. Jeff looked through the transformation length and decided on 5 minutes since he did not want to transform into a penis too quickly nor too slowly. Jeff also checked the option to include clothes in his transformation as he did not want to leave clothing behind. He wanted to enjoy the transformation into a penis, so he checked the "pleasurable transformation" option. He made sure that he could see things from the viewpoint of a penis even though he did not have eyes.
He checked temporary mental and reality change as he did not want others to worry about where he was while he was his father's penis. However, he wanted to remember the changes and his experiences as his father's penis, so he altered the settings to allow only him to remember everything.
Jeff finally looked at the duration of the transformation. Jeff could not decide how long he wanted to be his father's penis, so he looked at the preset options. He did not want "Permanent and Irreversible" as he did not want to stay as his father's penis forever, but he also felt that being his father's penis for a day was too short.
Jeff looked over the settings again to check that everything was correct when he realized that he would not have much fun as his father's penis if his father was not going to use him. Jeff went back to the options about his father and checked the option for his father to be sexually aroused.
Satisfied with the changes, Jeff hit the go button and waited for his father to come home. A countdown timer for 6 hours appeared, counting down to when the changes would start.
Nearly 6 hours later, his father had already come home. Jeff was waiting eagerly at the computer for the countdown to reach 0. There were still 5 minutes left, and Jeff could not wait for the transformation to start. Finally, the countdown reached 0, and a strange beam was emitted from the portable emitter and it hit Jeff. Another similar beam hit his father, who happened to walk by.
Involuntarily, Jeff stood up and followed his father to his room. He felt a strange urge to remove his pants and underwear. However, before he could even touch his pants, they disappeared, along with his underwear.
Jeff turned around to see his father completely naked. Suddenly, his father grabbed Jeff by the back and thrust his penis into Jeff's asshole. Jeff was a bit shocked by this but he knew that it was part of the transformation, and that his father was doing this involuntarily as well. Jeff and his shirt slowly began to shrink until he was only a foot tall, and his ass fused to his father's crotch, unable to detach. He watched as all his hair fell off his body and as his fingers and toes fused together and his limbs started retracting into his body. His body began to smooth out until it became just a tube of flesh. Jeff was disheartened at seeing his own penis and balls shrink away into nothing. His neck started to widen until it reached the width of his shoulders and was indistinguishable from his body.
The bones in Jeff's body were slowly shrinking and eventually were all gone. His limbs had completely disappeared, and his shirt, now the same color as his father's skin, was securing itself around his ass, at his father's crotch. Jeff's digestive system also simplified into a simple tube running through his body, and all other organs disappeared. Jeff watched as blood vessels from his father's body started to grow into him, further accelerating the changes. There was a strong pull on Jeff's head as he was forced to look up. His ears and nose flattened into his head, and his eyes slowly began to shrink too. However, he was still able to see the changes as he had checked the option before starting the change.
His shirt was now starting to stretch upward toward his head, as his lips disappeared. His teeth disappeared one by one as his mouth tilted and stretched until it became a vertical slit across his head. Finally, his shirt, now his father's foreskin, grew to envelop his head. Jeff was now his father's penis.
Jeff's father, being sexually aroused now due to Jeff checking that option, started to stroke Jeff. Jeff felt his body lengthening and turning upward and the foreskin retracting as his father stroked him more and more. Finally, his father had an orgasm and Jeff felt a rush of liquid that spewed out his mouth. It was white, and Jeff immediately recognized it as semen. However, Jeff was enjoying his time as his father's penis.
Afterward, his father redressed and cleaned up the bathroom, then went to sleep. Jeff was now stuck in a dark place - his father's underwear.
The next morning...