Lisa realizes her mother is going to be pissed i she finds out about Jeff. So she decides to turn Don into Jeff, without Don knowing. Because she was evil she did want him to suffer a bit so she made him notice the TF until itw as complete. Don felt his head reshape to look like Jeff's. The rest of his body kept changing. His feet, legs, etc. Don went to the mirror and noticed he was turning into his best friend. He would scream but Lisa muted him.
Next was his penis. Don, who sported an 8" manhood knew his frie d was a 4 incher. He watched a s his dick got smaller. 'I AM GONNA LOOK LIKE MY SHORT FRIEND. THIS IS THE END' thought the silent don.
He became shorter in height from a 5'10" guy to a 5'2" one. His feet got smaller and he no longer fit in his shoes.
The last part is weight as he gained 24 pounds in 24 seconds.
"Lisa, I am going to the library. Be back in 10." Said Don/Jeff