"How's it possible, doctor?" Matt asked.
"Do you sleep in the same room?" The doctor questioned.
"No, well... no, since a year ago." Matt replied.
"And did you use to masturbate while both were there." The doctor questioned again.
"Oh gross!" Jason immediately said and the doctor realized that he never saw his brother masturbating in their room.
"Uhm... maybe." Matt said a little embarrassed. "But it was only after midnight when Jason was deeply sleeping."
"No way! Jason!! That's nasty!" Jason yelled.
"Hmm... So, since Jason has been exposed to your testosterone before he hit puberty, he's taken some of yours." The doctor said while he inspected both brothers' penises. "That makes you even more suitable for our project, gentlemen!"
"Suitable?" Matt repeated. "What do you mean? Isn't enough to make grow our dicks?"
"Of course not." The doctor said while he indicated to his minions to tie up the guys in test tables. "Our company got funds from selling sperm."
Matt and Jason were struggling while they were tied to the tables. The minions tied their wrists, neck, forehead and ankles. They carefully put a belt on Matt and Jason's waists because they didn't want to hurt their still prominent erections.
"Let's us go!!" Matt yelled at the doctor.
"Please! I wanna go home!!" Jason cried.
"I'm sorry, gentlemen, but you signed a contract so you're going to stay here for a few months." The doctor said as he prepared a syringe with an orange substance in it. "I need to put a little injection on you..." He injected Matt's dick and then he did the same on Jason's. "This will take away your capacity to contain yourselves."
"What does that fucking means?!!" Matt was yelling when he began to drip cum from his dick tip. "Holy shit!!! WHAT THE FUCK DID YOU DO TO ME?!!"
"Quickly, guys. This kid has started to produce." The doctor told his minions who started to put a weird machine on Matt's penis that was connected to a container by a transparent tube.
Matt was looking scared at the white goo coming from his penis to that big container.
"Your contract will be done when you fill this container." The doctor grinned. "and don't worry about your food, we'll feed you until then."
"Excuse me, doctor." A minion said. "This one is not producing any milk."
"Hmm... I was expecting this could happen." The doctor said while he stroked Jason's dick. "Although his penis has grown due to his brother's influence he still needs to hit puberty to produce semen."
"Let me go!!" Jason cried.
"Let my brother go!!" Matt yelled. "He's not useful for your purposes!!"
"On the contrary. He's perfect for our new product." The doctor smirked while he prepared another syringe with a green liquid in it.
"What are you going to do to him you bastard?!!" Matt yelled at the doctor.
"Nothing for now." The doctor said as he got closer to Matt. "This one is for you."
"AAAAAAHHH!!" Matt screamed when the syringe entered in his balls and injected the green liquid inside him. Almost immediately, his testicles began to fill out like water balloons until each one was bigger than his head.
"A big dick doesn't mean a lot of cum!! Hahaha!!" The doctor laughed while he squeezed Matt's big balls. He screamed in pain once again but somehow it was also stimulating because his thin line of cum highly increased into a powerful stream. "You can produce a gallon per hour now. What an improvement, huh?!"
"You fucking bastard!!" Matt yelled but he was starting to get aroused from all the pain he was getting.
"Ha!" The doctor smirked. "Ok, now it's time to prepare your little brother's procedure." He took a new syringe and filled it whit a white liquid. "This will go to hurt a little, boy!"
"No, please, NO!!" Jason cried while the doctor injected the syringe in his penis. "MAAATT!!"
Immediately Jason's body began to bubble starting from his penis and quickly going everywhere creating lumps that were molding his body and adding mass on him as well as his skin was changing from soft to rough. Thick drops of sweat were coming out from his tanning skin as muscle were developing in his arms, legs and torso.
Suddenly, a crack sounded and his bones began to painfully thicken and elongate making Jason taller and bulkier in a matter of seconds. His feet went from size 8 to 13 when his toes reshaped to look like adult ones, his sole lengthened and arched while he twisted his feet in pain.
Matt can't believe it, his little brother looked like a teenager version of himself and as big as him. His cries started to deepen at the time a lump was protruding from his neck and now he even didn't sound like a kid at all.
"Matt!! Help me!!" An obvious teenager voice called for his brother's help although there's nothing that Matt could do but stare at him. When body hair started to spread in Jason's armpits and groin, Matt realized that his brother wasn't a kid anymore.
Finally, the former boy started to drip cum and other fluids from his already big dick which was quickly contained inside the same machine that was attached to Matt.
"Excellent! Now we have to good young men to milk for the next month." The doctor cheered. "However..." He prepared the same green liquid injection and he inserted it in Jason's new hairy balls which immediately began to pump like water balloons until they were as big as Matt's.
"Please, let us go!" Jason sobbed when he felt the extra weight between his new hairy legs.
"That's all for now." The doctor said. "One of my men will come in an hour to feed you."
He and his minions left the room leaving the brothers attached to the milking machine.