Story trade with @just-a-jock hope you enjoy it bro!
"And what are you two supposed to be?" Thomas inquired looking up at his older brother and cousin eagerly showing off their "costumes" for the party.
"Elaphants ain't it obvious bro?" His older brother Miguel laughed, smirking while their cousin Diego nodded grabbing the trunk on the costume to lift it up. "Buuur!" Was the sound he made before flexing. His attempt to copy a elephant sound. The two of them, at least in Thomas' opinion, looked ridiculous in nothing but a black elephant head thong placed so their dicks filled the trunks. Lewd, ridiculous, and...to be honest exactly what he'd expect from them.
"Wanna come with? we got one more?" Diego asker grinning and holding up a bright red elephant head.
"No thanks, I don't like those kinds of parties" Thomas said.
"Costume parties?" Miguel woundered.
"Slutty costume parties" Thomas clarified. "especially if everyones gonna be dressed like that"
"But all the chicas will love your trunk!" Diego enticed laughing. Both his cousin and brother knew Thomas was gay and they seemed chill about it but they still liked to joke. In fact it wasn't just his sexuality and interests, Thomas looked a little different from his realitives as well. They both had short straight black hair and dark latino skin, darkened more from the tan they got going outside shirtless a lot. Where Thomas had medium length curly hair and from being inside all day was certainly lighter than them.
"No thanks" Thomas confirmed. The two of them seemed to look at each other for a moment. Then they both pounced on him, each grabbing an arm to pin him down before he could react. They started to force off his clothes. They pulled off his socks, shirt, pants and boxers. He was home so he hadn't been wearing any shoes. He couldn't even cover his now exposed crotch because Diego was still holding his arms while Miguel grabbed the third elephant head and pressed it down on Thomas' crotch, even moving it so his cock was in the trunk. It seemed too big and he noticed for the first time the trunks on his brother and cousin were different sizes. They must have ordered them so the trunks were the right size for their dicks. This red one was quite long compared to theirs. Oddly enough it was just the head, not the thong part. However that didn't last long as the trunk started to heat up as suddenly straps seemed to grow out and wrap around his waist, attatching behind him to form the thong. Diego let go of Thomas' arms as he jumped up to standing.
"WHAT THE FUCK GUYS!" he shouted at them as they high fived and he reached to remove the throng but as he did the trunk seemed to move slightly. Scrunching up then elongating again. Up and down. Up and down. Slowly, almost as if it was jerking him and as weird as it was, his dick started to harden. He let out a involuntary moan as his cock started to grow as it was pumped. "Wha? How" he asked looking up at his realitives as if for answers but they just grinned at him then grinned at each other. The trunk was slow and methodical, like an expert hand. He squirms in place moaning more, wanting to stop it as his dick was getting longer and thicker beyond its normal size hard. The solution was so simple. Just take the damn thing off! But whenever he moved to do so, the jerking sped up, causing his arms to drop to his side and another involuntary moan to escape his throat. The pleasure centers of his brain, the nerves in his dick, betraying him as his cock expanded out inch by inch. "Take it off!" He pleased to his brother and cousin. He had been a decent 3 inches soft and 6 inches hard but now his cock was 10 inches hard and filling out the trunk of his new costume nicely.
"Yeah bro! Perfect for spreading the family genes with some sexy chicas!" Miguel shouted grinning as he walked over to playfully tug at Thomas' trunk covered crotch. His brother and cousin often did that to each other playfully to joke about being gay. Diego grabbed his trunk again making the mock elephant noise. Thomas felt a dumb grin spread across his face and he gripped his own trunk and lifted it up making the same nose.
"Buuurrr!" Followed by a dumb sounding chuckle. His ass starts to firm up with muscles and his thighs also begin to firm up looking like he does a lot of squats as an add thought popped into his head that his legs were perfect for wrapping around an opponent on the mat....what? Sure Miguel and Diego did wrestling back in high school but Thomas was nerdy...he wasn't on the wrestling team or any team right? However, as he shook his head trying to fight off these new memories the trunk started to speed up causing him to lose focus and moan as he started to cum in the trunk. He didn't notice the bottom of the trunk starting to swell with his cum.
The changes moved down as his calves began to ache and swell with muscle. As his feet began to grow wider and bigger. They grew from size 9 to a sexy size 12 and as much as he wanted to scream or yell at his brother and cousin or do anything he couldn't because that stupid trunk was still jerking him off! It would speed up during changes and become slow and was almost methodical as he thought of resisting, causing him to moan and let his eyes roll back effectively paralyzing him.
"Yeah bro! Nice wrestling legs!" Deigo cheered and to Thomas' horror he looked down, they would be perfect for that.
"Wanna go a round bro?" Miguel asked.
"F-f-oohh" he moaned again as the trunk jerked him off.."fuck no! I want you guys to quítame esto!" [Get this off me!]. Thomas was confused by the sudden slip into spanish. He was born in the States but most of his family was from Cuba so, sure, he spoke it fluently to talk with them but to his brother who knew perfect english and outside the home he always spoke English.
His thoughts were cut off though as the trunk started to speed up again causing him to moan and gasp as he started to cum again and Miguel took advantage of the distraction, getting into a wrestling stance and jumping at him. Miguel soon had his arms wrapped around Thomas' waist and pulled him to the ground in no time. Wrapping his legs around him and sitting on his chest. Miguel laughed and raised his arm, shoving his sweaty, hairy pit in his face. Thomas had no choice but to breathe in the musky smell as the trunk seemed to quicken the jerking. A tan began to spread around his crotch and ass and down his legs and feet. His skin was already somewhat light olive from being hispanic but he was a bit lighter than his brother. Not anymore! The dark tan spread up his chest next. His stomach firming up into slight abs which tightened until he had the beginnings of a 6 pack just like his relatives. A light dusting of black hairs grew around his belly button and down forming a treasure trail to his crotch. Miguel smirked moving his pit away from Thomas' face but staying on top of him as he reached down, pinching Thomas' nipples. That combined with the scents and the constant jerking of the trunk caused him to moan out.
"S-stop!" He cried out as the tan moved up to his chest which pushed out into two large, square pecs. Pushing out to hang over is abs, which caused the nipples to hang down slightly as they started to get bigger. His brother pinches the growing nipples, eventually letting go to show they have grown errect and pointed from the stimulation. Something tells him they are going to be almost constantly like that, poking out through his shirts when he bothers to wear one. Just like his brother and cousin. His shoulders and back broadening as the tan and changes move down his arms and back. His biceps and triceps buldging out. Dark tan, dark hairs, and viens popping out along them. Even some tattoos etching themselves across his upper chest and biceps. His hands began to swell up getting bigger and stronger.
"¡coño si!" [Fuck yeah!] Diego shouted doing a double bicep flex as Miguel finally got off him.
"Huhuh I won!" He declared as Thomas stood up angry but before he could say or do anything Miguel was flexing too in that same pose. Without even thinking about it Thomas found himself also flexing doing that dumb pose. In doing so he exposed his armpits which previously only had a very light dusting of hair but now they itched as longer dense black hair sprouted. Instantly becoming sweary and smelly as the wirey hairs grew long enough that they'd poke out even with his arms down. Hell they'd spill out of his shirt sleeves too. The smell was a mix of sweat, BO, and something else... fuck axe body spray!
"One of us!" Diego chuckled and Thomas frowned realizing he was acting just like them.
"No way!" He shouted covering his mouth. He hadn't noticed his adams apple get bigger and his neck stronger with muscle. His voice deeper and dumb sounding picking up a slight accent as though he had grown up in Cuba like his family. He didn't wanna be like them but even just that thought was enough to cause the trunk to speed up more and more until his mind was clouded once again, being forced to cum again into the trunk. It grew heavier and swelling and filling more. He felt his balls seem to swell more with each cum, filling with strong hetero seed.
"Haha giving your rabo [dick] some practice?" Miguel questioned, smirking and giving Thomas' crotch a playful tug. "I bet the Rodriguez triplets are gonna be excited!"
"¿Quién?" [Who?] Thomas asked confused.
"Our dates for the party" Diego explained. "They are some hot chicas!"
"But come as a set so we needed a third guy to go with us!" Miguel shouted as Thomas realized why they were doing this now but was powerless to do anything as his dick and body were turning against him. An intense heat overtook his face and his chin itched as facial hair grew. His face seemed to harden and age a bit. He was looking more jockish and manly. His hair started to darken slightly and shifted from curly to straight and grew out longer. Thomas' physical changes seemed complete.
"Fuck! I don't want to go to the.." he was going to say party but was cut off by the trunk jerking him again as he moaned. Miguel pulled out his phone showing him a picture of the 3 latina sisters. Thomas felt his mind turn on him next. Shifting from thoughts of pecs and hairy bods to thoughts of tits and curves. The Rodriguez sisters looked fucking hot and while he tried to fight it he couldn't stop the fantasy of he and his bro and his cousin banging the three sisters. All three of them impressed by their massive trunks. Fuck they wanted his rabo! [Dick!] And he wanted them!
"What you think Tomás? Still don't wanna go to the party with us?" Diego asked. Tomás wanted to say no but he felt a headache as it was getting harder to think of much besides working out, showing off, sex and partying. Being called by a new name seemed to click his new jock persona into place as he came one more time into the trunk. Moaning as what was left of his old self was jacked out. The trunk had a new weight to it, pulling him down slightly as it swung with each step. The bottom filling up with his seed and getting weighted down. He hardly noticed it before but after cuming several times the collected sperm was now noticable. He should have been humiliated, grossed out! Wanting this off or at the very least to clean it out. But no, instead he gave a dumb chuckle "¡coño si! I do!" [Fuck yeah!]. The new Tomás couldn't wait to go score with his bro and cousin, excited for his new life as a jock just like them! Miguel and Diego grinned and each other and high fived! They had a new bro to party with, workout with, and just be a bro!
"Haha exciting that Tomás is gonna spreed the family genes, si?" Miguel asked Diego who laughed and simply said. "¡coño si!"