Rudy chooses the genital swap to test the gun. Due to phimosis, he has been circumcised as a child. Having a foreskin was always a curiosity to him. His brother was luckier than him. He narrowly avoided circumcision and inherited a slightly tight foreskin.
The swap gun beeps slightly but no beam is visible coming out of the barrel. Yet Rudy feels tingling inside his penis and balls right after shooting. It's like having pins and needles, but it's not pleasant to feel them there. Across from him, Ben frowns and rubs his boxer shorts. He felt the same thing between his thighs.
"So? Are you going to tell me what you want?" Ben gets impatient.
"Wait a minute" said Rudy.
Rudy unbuttons his shorts and pulls on his boxer shorts' elastic to look inside. He turns around to hide from his brother.
"What are you doing, man!?" Ben wonders.
Rudy can't believe his eyes, there's an uncut dick inside his boxer shorts.
"It works!! Bro, it's crazy. I stole a package at work. It wasn't what I expected but... Do you see this kind of gun? It allows you to swap body parts. I just did a test, and it worked!" Rudy said speaking fast.
"Huh can you repeat???" Ben didn't understand anything he just said. "Swap body parts?" he asks.
A picture is worth a thousand words, Rudy pulls down his underwear in front of his brother.
"Look, it was just for testing. I'll give it back to you later." Rudy said.
Ben is surprised seeing a foreskin on his brother's dick. He doesn't make the connection right away.
"Dude, how did you... Oh shit! Is that mine?" Ben is surprised.
Ben pulls at his boxer shorts' elastic and finds his older brother's circumcised penis hanging between his thighs.
"It can't be!!!" Ben is panicked.
"Isn't that great?" Rudy asks.
"You should have asked permission before doing that!" Ben replies, annoyed.
"Meh, it's okay!" replies Rudy.
Ben sticks a hand into his underwear to touch his new penis. The touch of his hand makes him slowly stiffen. Living with a below average sized penis, suddenly having his older brother's longer and slightly wider dick feels weird. He plays with the shaft's skin and discovers being circumcised strange sensation. It feels odd and unnatural for him. Finally, he notices that his brother's dick rises higher than his own. It is straight and goes upwards. This suddenly gives him a hot flush and arouses him. To avoid his older brother noticing it, Ben heads to the kitchen for some privacy.
Rudy saw it and understood that his lil' brother is confused by his new endowment. Besides, being alone in the living room suits Rudy. He's hard now. He looks at his younger brother's dick tied between his thighs. It is shaped like a bottle and stands horizontally. This makes him laugh. He knocks on it and watches it swing. Rudy knew his brother's dick was smaller than his. About 1 inch shorter is not much but when you look at it is a lot. He takes "his" penis in his hand and starts playing with it. He can't help but let out a restrained moan. The feeling of his new foreskin covering and uncovering his head is incredible. It's like he's been waiting for this moment for a long time. It's a bit of a shame he's finding this out with a smaller dick...
Suddenly someone rings and knocks on the front door. The two brothers jump. They quickly get dressed.
"Go see who it is. Meanwhile I'm hiding the gun" orders Rudy.
"Wait, we should swap back our dicks first!" Ben warns.
"We don't have time. Come on, go" Rudy said.
Rudy hides the gun in a cupboard but forgets to hide the box in the kitchen. Meanwhile, Ben puts on a long t-shirt that hides his hard-on. He goes to the door.