Nate ponders to himself for a super serum is having some...ludicrously arousing effects on his brother, your brothers slow moans as he strokes his cock leaking pre cum on the floor as well as fondling one of his pec's. Your hand firm on the other one but you manage to snap yourself out of the hot trance your brother put you into with his body. "w-why don't you get dressed...no need to...be naked." Nate said feeling the disappointment rise up from the back of his mind wanting to witness every moment but he knew in his heart he had to be the voice of some reason in this, scientific medical situation. Chris frowns but then smiles mischievously, "oooh get dressed...right" Chris says as he gives his brother a nice wink before heading upstairs. His heavy footsteps following him up the stairs as he leaves Nate's sight.
It wasn't long till Nate heard the rattle of his brothers feet against the stairs once more and he returned in..well it was obscene to say the least being that he wore some of his old clothes. A t shirt that was another hand me down but after Chris's last growth spurt, he it was very close to tight on his body, his nice little super hero shirt lifting up showing a hint of that 6 pack. The neck ring being strained by the boys newfound pecs and the sleeves tight around his muscular arm. Chris gave a knowing flex and the two could hear the material strain. Looking down lower didn't help, Chris's dick still out and still hard throbbing in front of the two, leaving a gap of waist visible. His strong legs straining the shorts and underwear he put on while the bulge of his balls still showed underneath. "hehe couldn't fit my..monster in it without probably ruining it early" Chris teases with a smile swaying his hips side to side. Finally below he wore just a pair of socks and shoes..altho they were told not to really leave the house in terms of the ...experiment but at this point the experiment seemed to be getting upsurd.
Nate had to blink and clear his mind as Chris flexed in front of him, "so...what you think..you said put on some close so i put on something that'll fit..." Chris says his cock bobbing in front of the two. Nate gave Chris's dick head a poke with his finger pushing it down a bit but the hard dick was trying to fight back, Chris visibly biting back a moan smiles at his brother. "when i said put on clothes...i didn't mean this..." Nate said slightly blushing hard. Chris mischievously smirks back before groaning as his clothes get tighter, "oooh growing again..." Chris moans as he begins to get a few inches bigger and slow tears fill up the room. Chris opens his eye's and see's himself eye level with his brother and his muscles just as big. "Mmm yeah...but its not.....done.." Chris moans some more as it continues his growth and muscles spiking up and swelling out. Nate could feel Chris's dick pressing hard against him as it grows longer and thicker. Nate grabs the shaft his fingers unable to wrap around it anymore, pre leaking onto his chest now as it slides up against him. Chris swells even bigger the clothes he wore to tease slowly ripping in many places as he flexes his body to wear out the fabric even faster. Each rip getting wider and wider with each flex of his bulging body. His shirt being the fist to burst off flying into the couch in pieces as his pecs burst forward being massive slabs of muscles, his biceps like basketballs now of muscle and his abs, well Nate couldn't say anything else but it was a magnificent 8 pack. Chiseled to a height unlike anything he's seen, Chris's cock now probably 2 feet long growing obscenely massive as Chris pants in reverent pleasure. He shouts out loud as he finally starts to cum, his thick seed shooting and drenching Nate and the couch drenching the area in his boy musk. "Ahh yeah....this is sooo....mmmmm" Chris moans out shooting another load as he gets even bigger....and bigger.. and stronger..is balls the size of grapefruit and surpassing that to softball size. Thick and holdable by the now 7ft boy as he grew further over nate.
Nate was ultimately surprised and bashful witnessing this especially as Chris's fat member soon gets close to Nate's lips, the temptation is there, the desire too. Nate tries his luck licking up the cum still leaking at the tip as well as the Chris moans feeling Nate's warm tongue begin to slide into the slit. "Oooh...right there....right there..." Chris moans out leaning back into the wall to give Nate a better position into getting that dick into his lips. Nate laps up the cum, and sucks up the boys semen, drinking down gulps all the while pleasuring the bigger boy making him moan and buck his hips hard. Chris's moans are so loud they shake his body as well as Nate's with the severe blowjob he receives. "Yeah.... yeaaaaah..."Chris moans as he shoots one more powerfulload this time all over nate as he released his lipsjust in time for that behemoth to let loose. Some of it still getting in his mouth but someof it shooting here, there and even the ceiling.
Nate slowly recovers from the blowback of cum, opening his eye's to see Chris built like an athlete now with strong powerful muscles. His body 8 ft tall body mere inches from the ceiling of the living room as his hair grazes the ceiling gently, his 3 foot cock still throbbing hard and full of energy. "mmmm... the felt so...goooood" Chris moans out, He grits his teeth and lets out a grunt squeezing in another few inches as his head impacts the ceiling making a dent. "Ahh that's better" Chris follows up with a smile as he opens his eyes finally and begins to look down...down...down..towards Nate. "Oh...hey there....bro..." Chris says giving his much smaller bigger brother a knowing wink sending a shiver down Nate's spine altho he couldn't tell whether it was fear or pleasure.
"Finally now it looks like i got there..." Chris says with a mischievous smirk , smug in every way as he flexes his now watermelon sized biceps. His concrete slab like pecs popping one by one as he makes them do a little dance for him. His marvelous 10 pack creases into his torso as he feels the line in the middle of them. He rolls his broad shoulders again and again and looks at his trunk like legs that have definition of thick written all over em. Not to forget his massive 3 foot hard cock that still bobbed eager for attention and his nuts like a beachball. Big and filled with so much cum that it could practically be seen that it was churning out more.
"I like what i see....don't you bro...mmmm...feels so good to be this big..." Chris moans out with a satisfied smile, Nate is in shock now listening to his brother speak, "nothing is ever gonna fit me anymore..." Chris says feeling up his pecs and nipples, tweaking them so they were hard and perky making the boy moan again. His dick twitches again from the pleasure until he stops and takes a step closer to Nate, his cock sliding against the top of the couch just behind him grazing by the older boys head like a powerful snake. Chris puts both of his hands on under Nate's shoulder and lifts him up. Nate legs begin to kick on in shock he grips Chris's hands and feels already how strong his brothers grip was on him. His lift up was however still gentle as he smirks smuggly, "yeah...can even pick you up now too" Chris adds to his triumphs.
Chris begins to laugh in excitement before he takes a finger and begins to rip off Nates clothes, "No need for this now , we're both guys even though one of us is bigger," Chris remarks as he continues to strip his brother. Nate tries to cover himself but lo and behold it doesn't really suffice. Chris was too strong to defy, and to arousing to want to defy, Chris lets Nate back down but onto his cock instead. "Hey Nate..try standing on my dick" Chris adds wanting to see if it can be done. Nate nods sheepishly as he stood up and the massive rod didn't budge. Acting as no more of a balancing beam making Chris laugh heartily. His chuckle echoing through the house as he was proud of another aspect of himself as well.
what happens next.
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