Tails has come up with a new experiment and would like Sonic to help test it out as usual. Just about his invention and the people involved

~ST~-~ST~

Growmones

Sonic & Tails

"Hey Sonic. Come down here for a sec."

"Kay buddy. I'll be right there." The blue hedgehog replied through the intercom.

Sonic was on the second floor just watching his daily dose of television. He heard Tails over the intercom and he went down to the basement of the Apotik house.

"Hey Tails! Where are you my furry friend?" Sonic arrived at the workshop and Tails was no where in sight. He then sat at Tails' desk and he spun around in his leather chair.

"Hey Sonic!" Tails popped up from behind the Tornado.

"So, got somethin' new with the Tornado again?"

"Actually Sonic, No I didn't. I actually took a different approach in my studies."

"Oh really? Thats very random for you!" Sonic was wondering what had Tails invented now. Although his attention wasn't on Tails it was on the ball that was placed on the desk earlier.

"Seeing that I had recently hit puberty... and that I will be hitting 16 soon. I had some episodes... Some odd events if you will."

"Where are you going with this Tails?" Sonic raised the ridge of his brow and his full focus was on the teen fox.

"Well... here just take a look..." Tails brought out a bottle filled to the brim with capsules inside.

"What are they Tails?" Sonic set the ball down and was now taking a look on the bottle and turning it around and upside down with the pills clacking in the jar.

"Well these are not your average pills Sonic..."

"Oh..."

"These are a type of growth pills." Tails seemed to jump up with excitement and put emphasis on his last words.

"Wait. What? What exactley do they grow?" Sonic then faced Tails again now in confusion and curiosity.

"You know... just... the penis. I call it... Growmones." Tails wasn't really nervous talking about it but he just wanted some suspense you could say.

"Whaaat? No way!" Sonic was blown away. Although he heard of these he never thought that Tails would actually make them. "Hey Tails. I never knew you'd be one to make these things."

"Well im a scientist and an inventor so my curisoty mixed with my knowledge of things and growing with experience causes you to create certain things like these once in a while. "

"So uh.. How many of these are in here?"

"Just about 80 pills... Maybe 100?"

"Wow thats a lot..."

"Yeah. But these things are easy to swallow. The one affect on these is just that One can increase the size very big."

"Well what if a female takes one of these things?"

"Well, its supposedly meant to make the penis grow and increase sexual hormones. So if a woman takes one of these pills it will do exactly just that but not grow a penis part."

"I see, so this things were meant for males only?"

"Yeah i guess you could say that..."

Sonic was so curious. His mind was going off about so many things about these pills. "Hey Tails mind if i try a couple?"

"Sure go right ahead! I needed a person to try and check it out."

Sonic unscrewed the bottle and took two and held it in his hand for a moment.

"Now try to help me if I do some stupid stuff."

"You can count on me Sonic!" Then he swallowed them. It was fairly easy to go down the throat so he had no problems there.

"So... feel anything? Any difference?"

"Not just yet Tails... but it kinda is getting hot in here...

"Oh well lets go upstairs then, it get kinda stuffy down here."

Tails and Sonic went up to the living room and they sat on the sofa. Sonic on one side sitting his casual way and Tails sitting his body facing Sonic observing his actions and patterns occasianally looking down at Sonic's crotch for any physical differences. "Nothing yet Sonic?"

"Nah... oh wait my stomach feels so warm... its moving towards my crotch..." Sonic felt a rumbling in his abdomen. Then a heat between his legs. His balls then started to shake on its own as if it was alive. And slowly began growning in size. "Ugghh.. this feels so weird... My balls are growing..." Then as his big blue melons stopped growing his penis then popped out from its sheath slowly and grew to its hard erection state.

"Ahhh..." Sonic's dick got up to his normal 7 inches size and then stopped for a second and then increased both in length and girth. "Aahhh.. this feels so good." His penis grew to proportions as equal as his balls were. As Sonic's cock grew his balls grew a little more and some pre cum started to flow out. "Aahh Tails? Am i supposed to be this horny? I can't hold it but it just comes out."

"This is actually normal Sonic. Just let it do its job. Your testicles are producing more and more sperm and in reaction some maybe escaping through because its growing at the same time."

"Okay I trust you."

"I know.." Tails looked at the sizes thats Sonic had grown it was amazing to see. He guessed that Sonic's penis was just about more than a foot maybe a foot and a half.

Sonic was in so much arousal he almost couldn't take it. He was now following his instincs. His penis was just right in front of his face, shiny and wet. He then took it in his hand and he leaned forward and licked it. Sonic liked how he tasted. He wanted more because it felt really good. So he pulled his cock more towards him and he stuck his tongue inside the whole of his penis. It could fit in the slit on the head and he was licking up all his pre cum that was leaking out. He was in soo much pleasure that he felt as if someone else was stroking him. He turned his head cuz he remembered Tails was present, and his hands were all over his penis. Tails' hands were amazing as it moved up and down his shaft. Sonic then realized that his penis stopped growing.

"Tails, I think it stopped already."

"Great... I was waiting." Tails took the initiative and he stood up and sat infront of Sonic right in between his legs which were spread wide open so his balls could hang and have more space. Tails took one hand and placed it on his buddy's balls and carressed it. He took the other and continued stroking Sonic's huge member up and down.

Sonic then placed his mouth atop his dick and covered it with his mouth, he sucked and bobbed his head up and down his length. Tails too placed his mouth upon his friend's cock and licked it up all around. The blue hero had so much pressure going on throughout his joy stick and was flowing out more and more pre cum as this progressed. His senses were increased and he could feel every fiber of his penis and every part of the pleasure placed on him. He was about to climax.

"Yo Tails, I'm gunna cum soon its soo close, I'm about to burst gallons."

"Let me take care of that." And with that Tails got up on his feet and he climbed ontop of Sonic and stood in front of him Tails' hard throbbing penis hanging right in front of Sonic's face. Sonic moved forward and sucked on Tails cock. "Aahhhh! Sonic!" Tails flinched as he wasn't expecting this treatment.

Tails then positioned himself to get ready for the big moment of his life. He bent forward causing Sonic to follow suit. Then Tails grabbed Sonic's oh-so-humangous dick and placed it right at the entrance of his tail hole just between his twin tails which were lifted high in the air. he felt Sonic poke him just behind him and he felt all the precum naturally lubbing him up. Sonic pulled of his gloves and pulled off Tails' also and reached around and inserted his finger into his partner and moved in and out stretching Tails but hole as he went. Then a second finger went in and Sonic started scizzoring Tails.

"Aahh! Sonic! Stretch me more! Lube me more!" Tails moaned and he was dripping with pre cum. Sonic alternated between his penis and Tails ass to place more of his precum to lube up Tails for the ride of his life.

"Sonic I think I'm ready for you!" Tails moaned and he braced himself.

Sonic pushed into Tails slowly and Tails pushed down on him as well. The kitsune was very much in pain as a gigantic penis was being inserted into his ass.

"Fuck Sonic! Your penis is so huge!"

"I know Tails!"

"Shit I can't think straight!"

"Tails I'm about to blow soon!" The rings of muscles in Tails' anus incased Sonic's huge cock and he felt every grove and every pulse. "Uggh Tails! You're soo tight!"

"Aaahhh! It hurts Sonic! But its soo good!" Tails huffed as he was being filled up with Sonic's abnormally large penis. The kitsune's body was being overwhelmed with pain but more pleasure. He was getting exauhsted pretty quick.

By the time Sonic's dick was fully inside Tails, a huge bulge was present on his stomach. The head of Sonic's penis was poking at the insides of Tails. The young fox rubbed his abdomen feeling his friend's penis inside of him from the outside.

"Uugghh Tails! I can't anymore..." Sonic sat back down and was letting Tails ride his cock. Tails' ass was stretched so much it starting stinging but the pressure of Sonic's huge penis inside of him gave so much more pleasure.

"Aaahhhh! Sonic! I'm gunna cum soon!" the two-tailed fox's faced scrunched up as he beared all the pleasure and pain he was receiving.

"Tails! Just hold out! Ugghhh! AHHHH!

"Together now Tails!" Sonic got back up and pushed in and out of Tails as he kept in sync with Tails' while he pushed down on his penis. And at that moment,

"AAHHHGGGGG!"

"UNNNHHHH!"

The two had climaxed Tails huffed and puffed. He came all over himself some landing on top of Sonic's face and most on his abdomen.

"Aahhh... Sonic its soo damn warm...

"Your cum..."

"Aahhh... Tails.."

"Wait... Sonic your still cumming!"

" Huh? ohh I am?" Sonic felt all the fluids rushing out of him and it splurt one after the other not stopping.

"Ahhh Sonic its sooo good and soo warm your cum...

"Can my stomach even take all of that?" And as Tails said that, his stomach then started to expand.

"Tails, dude your getting fat..."

"Aaahhh... its alright i like the feeling of your cum in me."

Tails' little stomach became bigger and bigger as if it were a balloon. It got so big that Tails had to bend over backwards for balance.

"Ugh Sonic I feel pregnant..."

"Tails..." Sonic then started rubbing the yellow fox's big belly.

"Heh.. your little child full of my cum..." Sonic stopped ejaculating and Tails lifted off of Sonic's Ginormous penis and a lot of semen started to flow out, but not all.

"Aahhhh Sonic... I'm so full of your cum.. ahahah I probably look fat now..."

"No you don't Tails..." Sonic stroked Tails' fae and stomach. "You're beautiful." Tails blushed and kissed Sonic. And afterwards fell asleep.

~ST~-~ST~

As the afternoon arrived...

Tails and Sonic still stayed on the couch, sleeping. Sonic with his limp penis, still huge, and big ball sacs. And Tails with his big belly from Sonics' semen. And from then on... the two had nights and nights full of huge dicks and massive amounts of cum.