Flint had four brothers: Jasper, Jaden, Slate and Clay. Flint should have remembered that Jaden had the power to shrink people. Jaden's power manifested at puberty and he did shrink a few people at that time. However, he was only able to shrink them one foot. It was a noticeable size difference but not one that caused problems. All the people he shrunk returned to normal after twelve days and Jaden hasn't shrunk anyone since (as far as Flint knew) so flint forgot that Jaden had that power.
Their dad was irresponsible, often disappearing for months at a time, coming back just to stock up on food before disappearing again. Their mom was very busy at work and not around much to take care of the kids. So Flint started filling the parent role. He was very strict and pushy, always trying to make his brothers be better than everyone else. Trying to keep four brothers rounded up caused Flint to be stretched thin. He didn't have time to be friendly toward his brothers.
Flint said, "Jaden, I heard a complaint that you haven't been wearing a jockstrap."
Jaden said, "I only forgot one time."
Flint said, "That's not the way I heard it. I need to make sure you've got your jockstrap. Is it in your bag or are you wearing it?"
Jaden said, "I'm eighteen. I'm graduating in a month. This is really none of your business."
Flint said, "As long as you live under my roof ..."
Jaden interrupted, "It's not your roof. Mom owns it."
Flint grabbed Jaden by the waist band and pulled his pants open. "You're not wearing a jockstrap. It better be in your bag or your grounded."
Jaden said, "You can't ground me. I'm an adult."
Flint ignored him and searched through his bag. "It's not in here. Maybe I should confiscate your phone to teach you a lesson."
Jaden said, "Maybe I should shrink you to teach you a lesson."
Flint asked, "What?" but he already started shrinking. He had to look up to see Jaden's face despite being taller than Jaden. "You're shrinking me. You're in trouble now."
Flint removed his belt and prepared to spank Jaden but Flint was already so small that Jaden easily manhandled him and took the belt away.
Jaden said, "I ought to spank you. You're about the same size as a kid."
Flint then realized he was shrinking more than just a foot. "How small am I going to get?"
Jaden said, "I don't know. When you look small enough, I'll stop."
At this point, Flint's clothes started falling off of him. He grabbed his shirt to try to keep it on but his shirt was starting to get heavy and hard to hold onto. "Change me back or I swear I'll shave off all that long hair of yours."
Jaden said, "I think you're small enough now." He picked Flint up in one hand. "I don't think you'll be shaving anyone's hair at that size. Let me get a ruler to see just how small you are."
Flint struggled but Jaden held him tight. Flint said, "This is assault. I'm going to call the cops."
Jaden set Flint down on a shelf and held a ruler beside him. "Eight inches. That's a great size."
Flint didn't try to run. Flint continued to try attacking Jaden.
Jaden picked up some string and tied one string to each of Flint's hands. Then he hung Flint up so that his arms were spread and his legs were dangling. Then he tied one string to each of Flint's feet.
Jaden then took off his clothes. "You want to be sure that I'm wearing a jockstrap? You can be the jockstrap." Jaden pulled the strings tight around his waist and tied them in place. He grabbed the strings tied to Flint's legs an pulled them back between his legs until they were tight and tied to the waist string. It was a crude jockstrap but Flint would protect Jaden's genitals. Flint was pressed right up against Flint's genitals.
Jaden said, "Time to head off to school." He pulled his pants up leaving Jaden in the dark. Flint continued to struggle and yell but Jaden couldn't hear him.
He did get an erection though. He pulled open his pants and told Flint, "Calm down. I don't want to go to school with a boner."
Jaden almost laughed though when he saw his erect cock pushing Flint's stomach away stretching his arms and legs. Flint cried, "You're killing me."
Jaden said, "Oh no, I made you stretchy. You'll return to your normal size as soon as you let my cock go down."
Flint said, "It hurts."
Jaden said, "Of course it does. It's like being on the rack, that old medieval torture device but it's under your control. If you stop struggling, it will stop stretching you."