He wanted to test the perception, but not get caught in a situation with someone outside the house.
Facing back toward Zoe, he thought up a fun idea.
Jon raised his hand and pointed his middle finger at Zoe, "Give me that body below the neck" he whispered.
It was too dark to see, but Jon knew something had changed, his pajamas were hanging off his body. Still pointing at Zoe with his middle finger, he whispered "Give me that outfit."
Jon felt a shift in his clothes, they felt a lot more snug to his body.
Quietly, Jon tiptoed out of the bedroom, and pulled the door to.
In the light of the hallway, he already noticed the difference, still he raced over to the mirror.
There was Zoe's body, in her black pajama top with grey outlines, and matching pajama pants. But sat atop her shoulders was Jon's head.
Hearing Nikita still running around downstairs, Jon quickly turned and dashed down the stairs, He felt his body move in unusual ways, his breasts bouncing as he went down the stairs.
Making his way to the kitchen, Nikita ran up to him, being smaller than he was used to, Nikita knocked him right over, then walking over him & licking his face, something she usually did to Zoe in the morning.
Climbing back to his feet, Jon got the dog food out and prepared a bowl of it for Nikita. Barking happily, she started eating her breakfast.
Hearing a thud from upstairs, Zoe was waking up, Time to see if this worked he thought, hiding at the bottom of the stairs.
A few moments later, he saw Zoe's bedroom door swing open, and through it came Zoe, Yawning an rubbing her eyes, she dragged herself towards the bathroom.
"Is that what my body looks like?" muttered Jon, watching Zoe disappear into the bathroom, closing the door.
The house was silent for a few moments, but the silence was shortlived, Zoe let out a sharp scream.
Jon grinned "Awesome, the perception side works, and its not just copying.". Running up the stairs, Jon headed toward the bathroom.
"WHAT THE FUCK!" Zoe screamed again, swinging the bathroom door open. "JON, fuck, SOMETHING FUCKING WEIRD'S HAPPENED".
"What's going on?" said Jon, arriving at the bathroom, pretending to not know what was happening.
Zoe saw Jon & her eyes went wide, placing her hands on her mouth, she stuttered "Oh my god... I've got your... and you've got my..."
"Calm down" he said calmly, placing a hand on his sister's shoulder, who was now a good 5 inches taller than him. "What are you talking about?" he lied, again.
Breathing sharply, she pointed at Jon, "you've got mY FUCKING BODY"
I should toy with her a little more Jon thought. "What are you talking about? We've always looked like this" he said, gesturing at himself.
"NO WE FUCKING HAVEN'T" Shouted Zoe, "LOOK AT THE FAMILY PHOTOS" She pointed at the frame on the wall.
Oh crap, this could be ruined Thought Jon. But was relieved to see in the photo, their bodies were still swapped. "See Zoe, there's noting different here."
Jon left Zoe and started back downstairs. Very quietly, he whispered "you can have it back" twice.
Zoe screamed again, "Its all back to normal now! WHAT THE FUCK IS HAPPENING".
Turning to look up at Zoe, Jon tried to hide his smugness "Did you not get enough sleep last night? You're probably seeing things."
Continuing down the stairs, he heard his sisters bedroom door slam. Test successful he smiled.