The more he thought about it, the more Clark realized that aging himself was a good idea. As the adult, he would have to accompany Nick for next week's competition. He did not want to take the chance of anybody recognizing him at his current age, and he wanted to see how it feels to have a dad bod. He locked the door to his room and stripped off his clothes, eager to observe his body as it ages. He spent some time getting familiar with the controls before setting the number on the digital screen to 38.
With his hands trembling, Clark aimed the gun at himself and pulled the trigger.
As Clark departed his 20s and entered his 30s, hair started growing on his back, chest, and torso. A layer of fat started appearing on his limbs, torso, chest, and buttocks. Those parts of his body only grew as he got older. Wrinkle lines also appeared on his forehead, as did the beginner crow's feet by his eyes. His stubble started turning grey, with his hair not too far behind. As Clark was about to enter his 40s, the aging stopped.
Clark's attention went to his newly developed paunch. He moved his belly up and down in disbelief that he had actually put on weight. He felt the rest of his body, and discovered that he now had beginner man-boobs, thunder thighs, bingo wings, and a bigger ass. He concluded that he was definitely over 200 pounds, and maybe even became obese. He pulled out the camera app to see if he had actually gotten older and not just fatter. The grey hairs on his stubble was enough to convince him that it had worked.
"I'm really 38 now," Clark said to himself as he put the age gun away in his safe, "Wait until Nick finds out that I made myself older."
He then tried to put his clothes back on, but he soon learned that his jeans were too small for him. They felt very tight against his legs and groin, and he was unable to zip the fly up. His luck was not much better with shirts as a vast majority of them felt tight on him and outlined the paunch. He settled on the largest shirt he could find and a pair of sweatpants before leaving his room. Just as he left, he heard Nick's door open.
"I finished cleaning my room like you wan-" Nick said before pausing at Clark's body, "Clark, did you put on weight?"
With no need to lie to Nick, Clark turned around , went to Nick's level and explained.
"More than that. I used your age gun."
"You WHAT!?"
"Hey, don't shout at me Nick! Just because this is only for the week doesn't mean I can't punish you."
A shiver shot down Nick's spine, suddenly intimidated by Clark's stern tone. It felt as if Clark was Nick's dad.
"I thought that it would be easier for us to blend in at that science competition next week. It wouldn't make much sense for me to have a 9-year-old son at 28, but now that I'm 38 years old, we can fit right in."
"But how can we fit in if you're wearing sweatpants?"
"Good point, and I think this shirt is a little too tight for me, so I need bigger clothes."
After grabbing his keys, Clark directed Nick to come with him.
"I can't leave you here by yourself while you're like this. Besides, we gotta sign you up for that competition."