Ethan picked the ring up and put it in his pocket. He had decided to tell Eric about the ring when he got back to the car. He saw Eric strolling out, adjusting his large girthy buldge in his short, tight shorts. Eric got in on the passenger side.
"Hey, look what I found." Ethan said with a grin, he flashed the ring.
Eric lighted up, but started to frown.
"You know I was really looking forward to having your dick..." He said.
"Aw, it's alright. Listen, I was serious about offering to switch for the rest of the week." Ethan said, "Why don't we start with that and go day by day after that."
Eric beamed. Ethan was happy to make his little brother happy, but inside he was happier to have such a tiny undeveloped penis of his own. It was kind of embarrassing but he liked having a secret child sized dick.
The two brothers went back home, had a quick supper and went their separate ways.
Eric spent the evening checking his new package out in the mirror. He took a few selfies for posterity. He enjoyed stroking his new large dick and was surprised by how many times it could cum in a day.
Ethan spent the evening wildly excited. He finally had a chance to stroke his new dick in private. He jerked off until he had hard on and felt a burning pain of shame as he saw just how many inches he had now lost. His balls were so small too! He hadn't had a dick this small since he was prepubescent. He jerked to completion and was surprised to find barely any cum come out.
Both brothers decided that night that they would try to keep eachother's dicks for as long as possible, but didn't know how to bring it up with each other. Eric was much happier with his large package, it improved his confidence and energy, it made him feel more manly. Ethan was happy with the size and enjoyed the feeling of being ashamed of his size and keeping it secret.