It was a hot day and Simon and his dad were swimming in the pool in their backyard. Simon was 10 years old while his father was on his late thirties, both of them were blonde but Simon was a scrawny little boy while his dad was a big strong man with a lot of muscles and body hair.
Simon liked to play with his dad, but unfortunately he was a construction worker and he doesn't have too much time to be with his kid. So, when the pandemic started and everybody was at home, Simon was glad that he could spend more time with his father.
After playing and swimming for a while, Simon and his dad decided to relax for a moment. They sat on the poolside while they eat some chips. Their feet were still in the water and Simon can't stop thinking that his dad's feet were way more bigger than his.
"Hey dad." Simon said. "Why are you feet so big? Mine look so tiny next to yours."
"Well, when I was your age my feet were also tiny, but then I hit something called puberty and they started to grow a lot!" Simon's father replied as he wiggled his manly toes alongside his son.
"I know what puberty is." Simon replied. "My teacher says that puberty makes girls more like her moms and boys like her dads. So, will I look like you after puberty?"
"Probably. Would you like it?" Simon looked at his father from head to toe before he makes an answer. Despite his age, his father was in pretty good shape and he wasn't bold nor gray-haired, but on the other hand, he also was extremely hairy with monstrous hands and feet, and... well...
"Dad?" Simon sheepishly said as he kept his eyes on his shiny blue swimming trucks. "My pee pee will be as big as yours?"
"I, I don't know." Simon's dad suddenly blushed after he heard that and he kept his eyes on the prominent and kinda obscene bulge he was sporting on his shiny orange speedo. He suddenly remembered his youth when he hit puberty and everybody started to call him the three-legged freak. He learned to love his overendowed manhood when he started to date girls but it was several years later.
"Dad, I will tell you a secret." Simon said. "I'm really scared of the virus because I want to be like you but I don't wanna at the same time. Jeez, I sound like a moron."
"I don't think you're a moron." His dad replied. "When I was your age I was afraid of growing up too. I have three older sisters and I felt weird that I didn't looked like them. They're growing femenine and beautiful and I was getting hairy and brutish! But I ended up getting used to it and now I'm proud of my body and I'm sure you will!"
Simon gave his dad an awkward smile before he started to speak again. But before he could make a word, he suddenly felt an intense pain in his stomach. It felt like he had eaten too much or something poisoned. Simon quickly turned around to see his concerned father staring at him.
"Simon?!! Resist it!!" His dad yelled as he watched his kid groaning next to him. "Shit!" He cursed. He thought he has more time to tell his son that he was infected and probably he had infected him too. Well, now it wasn't a probability. Simon was growing in front of his eyes now!!
"I'm sorry, Simon! I should have tell you before but I was infected! My boss hired a new man who was a former kid but I didn't know it after a week! I'm so sorry!!" Simon's dad apologized but his kid was in so much pain that he didn't heard any word. His body was already changing.
"Ooooh! Aaah!!" Simon could feel his body expanding and he groaned as he felt his bones stretching and his muscles thickening.
"Ah!! Ugh!!" His legs and arms were quickly lengthening until he was surprisingly as tall as his dad. His feet were growing rapidly and now they looked quite similar to his dad's size 14 feet. To his father's surprise, they kept growing and changing until two giant size 17 feet were under water now.
"Aaah!! mmff!" Just as Simon was screaming from pain, the muscles on his calves and thighs started to swell to enormous proportions. They're so big now that Simon unwittingly manspreaded. "Dad, help me! It hurts! I feel soooo... heavy!"
Simon's face showed much strain as his body grew beefier and stronger. He didn't look like a kid anymore! His father need to move a little to give some space to Simon's expanding waist and torso. They can hear Simon's ribcage enlarging with each breath until the former boy was sporting a pretty muscular back and a nice set of abs and pecs.
"MMMF!!" Simon to stand up but he failed and fell in the water instead. His dad reacted immediately and helped him but Simon was so heavy now that it was difficult even for him. He could hear his son panting with a much deeper voice. Just then, he heard Simon's swimsuit starting to rip open.
"Mmmfff!" Simon moaned as he felt some relief on his now thick large ass bulging through his shredded trunk. His thick legs and wider waist were stretching the fabric to its limits as the seams were slowly ripping off.
Simon's face clenched as it aged rapidly through 25 years of puberty and growth. He looked completely different now. He looked almost like his father clon.
"I can't believe it! Simon you are identical to me!!" Simon's father said with a mix of surprise and worry as he gazed at his now larger son.
"D-dad!!" Simon managed to say between his moans as his eyes were rolling back with pleasure while he tried to take off the small clothing constricting his private parts. When he succeeded, his father gasped at the sight of Simon's thick cock and large low hanging balls.
"Oh my!!! Simon, you are getting a huuuge boner!! I can’t imagine how horny you must feel going through puberty that quickly." Simon's father watched how his son began to jerk his thick 11 inches cock. Simon immediately came with a deep moan and sigh of relief and passed out. Cum was everywhere including the water surface, but Simon's father didn’t mind. He knew that his son's needed to do it.
"How do you feel?" Simon's dad asked as he patted his son's broad muscle back.
"Uh? I feel... weird. Heavy, clumsy but strong at the same time?" Simon's baritone voice resounded through the backyard. "Is that how puberty feels, dad?" He said slowly standing up. He was about 6'9" now with large feet, legs, butt, muscles and a square face.
"Pretty much, yeah." His father replied as he watched his son flexing and inspecting his newly grown muscles.
"And... That thing with my pee pee, I mean my penis... Is that normal too?" Simon sheepishly asked. "It felt weird but... good."
"Yep, that's normal too and you will began to do it more often." Simon's father blushed a little. "Just do it in private and clean afterwards."
"Is my pee white and gooey now?" Simon asked as he take a drop of cum that was stuck in my new pubic hair and sniffed it. "It smells fishy."
"You have no idea." Simon's father said. "Come on, follow me. We have a lot to talk and you need some briefs too. I can see you're going to keep my three-legged legacy alive!"