"OK, Mom. I'll swap us back." Jason did so immediately and both were returned to their original bodies.
"Give me that!" Mom demanded taking the device from her son.
Mom looked over the device. She saw the option that swapped their bodies as well as lots of others.
The device was digital and she found the online help manual for the device. After looking it over for a while, she realized it could virtually swap anything between two or more people. It wasn't just physical swaps, but it also included mental swaps as well as emotional swaps and psychological swaps. It also indicated that no one would be able to notice the swap regardless of how ridiculous the swap was.
"Give me!" Jason complained.
"Not until after I'm done reading the instructions," Mom said. "If ever," she thought.
Reading a little more, Mom discovered the device had a timer on the changes. Right now the changes were in 'Forever' mode. Which meant the swaps would last forever unless the device was activated again. But it had a more safe and sensible 'timer' swap. I swap could be set to last fifteen seconds, half a minute, one minute, fifteen minutes, half an hour, and hour, 1/2 a day, a full day, a week, a month, or a year. Once the timer was set, the swap would reverse without the user doing anything to initiate it.
"Hey, let me try something," Mom said. Then before Jason could say anything, Mom swapped her breasts with Jason and set the timer for 30 seconds (half a minute).
Jason felt Mom's breasts on his chest immediately. Especially since they were sagging due to lack of a bra.
"Hey!" Jason yelled looking down at the protrusions on his chest. "Very funny. Swap us back!"
"I don't want to." Mom puts the device into her purse.
"No, really swap us back."
"Swap what?"
"These"
"Just those?"
"What do you mean?"
"Notice anything missing from your pants?"
Now that Mom mentioned it Jason reached for his pants. It was gone. Jason didn't have time to think about what he might do having his mother's boobs and pussy. Instead, without warning, everything swapped back to normal.
"It seems this thing has a timer," Mom explained. You can set it so that it swaps back. This is a good thing because if it didn't, it would only swap back if you can see your target and do it manually. This way you don't have to be in the same room.
"Cool."
"Anyway, I'm going to call work and we are going to test this out."
"Really?"
"Yeah, it'll be fun. Not like anyone will know what has happened."