Benny was watching at Johnny as he played on the puddles when a familiar pain hit him in stomach.
"No, me too?!" He burped as his stomach was swelling. Curly hairs sprouted on there as his abs began to push out. His torso was growing so fast that his shirt was going to burst out, so he managed to take it off before it was too late. Johnny saw it and thought that Benny was going to play with him.
"Come here Benny!" With his new strength it was easy to pull his little brother. Meanwhile, Benny was getting longer and thicker arms and legs. He was taking a manly body instead of his boyish one.
"Wait, Johnny." He babbled in a deep manly voice followed by facial changes. His nose grew, his jawline was squarer and covered in a growing beard. "Holy shit!" He cursed when he felt his rough skin with his huge man hands. Johnny was surprised of hearing his brother cursing and stopped pulling him. Benny fell on a near puddle and his tight pants were covered in mud.
Benny cursed again as he was struggling with taking his pants off so Johnny tried to help him. He put his bigger hands on his brother's waist and began to pull the pants. Benny's legs had bulked out so it was practically impossible to take those pants off.
"Sorry Benny." Johnny said before he tore his pants off. Along with the pants, Johnny also took off his brother's underwear, exposing his new engorged manhood to his little brother. "Benny! Your pee pee looks funny!"
"What the fuck did you do?!!" Benny yelled when he saw his fat dick laying under a nest of kinky pubic hairs. "Shit!!" He shouted as he covered his appendage with his hands. His face turned red of shame. He quickly stood up and run inside the house to look for something to wear. He didn't like to be naked, specially being this big and hairy.
Johnny realized that his brother was angry and he began to cry. It was so weird to hear him crying in his deep manly voice. Meanwhile, Benny was stumbling continously as he ran through his house. His tiny boy feet had grown from to a humongous size 16. Some curly hairs had appeared on them too.
Benny went his parents bedroom, he ran to the wardrobe and began to look for something fo wear. Next to the wardrobe there was a full length mirror and Benny saw himself for the first time. He looked exactly like his dad, at least what he remembered about him since he divorced his mother a year ago. But he had never seen him naked, so he felt ashamed of being that hairy and wondered if his dad was as hairy as he was now.
He began to look into his father clothes until he found a pair of old white briefs. He saw many boxers too but he didn't know they were underwear too. Putting his hairy thick legs through the briefs holes felt weird and when he covered his manhood inside his awkwardness highly increased. He looked at himself again in the mirror, his father's briefs felt a little tight on him. Maybe he doesn't look exactly like his father after all. He was glad because he dislike him.
Looking closely to his briefs, he noticed that his butt crack was half exposed. His ass was bigger than his father and when he looked at the clear dick silhouette he thought that he was bigger there too. He wasn't just bigger, but he was even bigger than his dad. He was disgusted.
"I can't go around just in briefs." He thought and began to look for more clothes. Meanwhile, Johnny was still crying in the backyard, his tears were mixing with the raindrops before he started a tantrum in order to get his brother attention. He fell upside down and began to madly jolt. He was taller than Benny but a lot less beefy and hairy than him. His lanky arms and legs were getting covered with so much mudd as well as his face and ass. His dick, longer but thinner than his brother was getting hard as it touched the wet lawn. His toddler mind can't control that feeling and in no time his cries turned into orgasmic moans.
Benny gave up, he wasn't able to find anything to wear beside those briefs. He sat on his mother's bed and sighed. He remembered that the last time he turned back to normal after a moment, so he thought that the best thing to do was to wait until it happens. Then, he remembered that he left Johnny in the backyard, so he went to see him. When Benny arrived, he was shocked by what he saw.
Johnny was intensely jacking off in the middle of the backyard. Tha rain was still falling over his naked body, so he didn't saw that he was also covered in too much precum. Johnny's big hands were moving up and down through the long phallus as they rubbed its 10 inches length. His balls were uncontrollably bouncing as well. Covered in mud and hair, Benny that he looked disgusting. He didn't want a man doing that in his backyard! But his body has a mind of its own, because he was getting an erection at the same time. He was also mindlessly rubbing his dick through the briefs fabric.
Finally, an orgasmic rush hit him and he kneeled in front of his brother and began to masturbate with a hand. He used the other one to rub his balls which were bigger than his little brother. He was disgusted but also too aroused to stop.
After several minutes of intense masturbation, they came almost at the same time. But they weren't satisfied, so almost immediately they started again. That's when the front door began to open.
"Oh no!" Benny shouted as he heard the door opening. He quickly came again and ran to hide himself. He was going to jump the fence when he remembered that Johnny was still masturbating on the backyard. He came back just to be seen by his mother.
"You?! What are you doing here?!!" She yelled more angry that surprised. "I told you we can't see each other here, Ben!"
She was mistaking him with his father, realized Benny. He was too shocked to say anything.
"And why are you almost naked?" She told him. "We agreed to see us until midnight, remember? Now, go to the room before the kids saw you!!"
Benny didn't know what else to do, so he obeyed and went to his room.
"Not the kids room! You dumb ass!!" She shouted him. "Don't you remember your own house after a week?" She sighed as she took his arm and pulled him inside her room. "I'll go to look at the kids. Wait for me here!"
Benny was so confused, he has no idea of what was happening but it was better to keep it than panicking his mother, so he stayed in the room with a growing boner inside his small briefs.