Mark comes up the stairs as you grab the Age O Matic from your room - you do a double-take as you enter and see a little kid's room with toys and stuffed animals. Oh! You set things so everyone thinks you are 5! You grab the device just as Mark comes in. He frowns. "Geeze, little guy! Naked again? Your mom said it's OK, but I wish you'd keep your clothes on when I am babysitting you."
Babysitting? That explains why he is here with a 5 year-old. It is weird to be looking up at him - you used to be the same height. That is easy to fix. You can make yourself back to your real age or make him 5 with you. Or you can make him younger than you, or just a little older. "OK little guy, time for dinner" Mark says as he grabs the Age O Matic from your hands and places it on a high shelf that you probably can't reach. Just Great! You were going to have to endure a day as a child with your former best friend who was now your babysitter with no chance of changing back.