Jon entered Mikey's bedroom and took a pair of his clothes out of the closet and began to get dressed. Mikey was still at the age when his mother picked out all of his clothes, and his closet and drawers were full of clothes with cartoon and video game characters on them.
Ten year old and sixteen year old male attire wasn't quite as far off as female attire. There weren't that many variations, although Mikey did have a few pairs of underoos in his drawer that he was weeding out for more mature undergarments, but Jon choose the underoos.
Meanwhile, Mikey had his turn in the shower and found himself unable to go back to his room to change, feeling a sudden desire to go elsewhere. He felt very odd about it. He was aware of it, but somehow, he felt as if something other than him was running his body.
His wish had made it so whomever Jon wore the clothes of would be unable to wear their own clothes. Jon must have gotten into his clothes. He tried to steer himself off the path he was on, but he couldn't.
He found himself walking into his mother's bedroom. She seemed unaware he was there as she put on her makeup in the mirror. Before Mikey knew it, he was in her underwear drawer, slipping into a pair of her unmentionables, unable to stop himself.
His mother worked as an executive assistant to a lawyer downtown. That meant she was expected to dress professionally. While he couldn't wear the exact outfit she was currently wearing, he seemed to be matching it quite expertly. Skirt, light colored blouse, dark colored jacket on top of it. His mother didn't like it when people called her secretary. She did some of that sort of work, but she felt she did a lot more too.
When he finished putting on his mother's makeup, he suddenly felt released from whatever magical hold had been placed on him, and was standing there, a boy dressed in his mother's clothing, which fit perfectly. And his mother, with a blank, zombie-look look on her face, was moving toward the door.
He followed her.