Hard as a rock, Adam looks at the full flask in his hand and drinks the entire thing. His father was distracted by the show, flexing and comparing muscles to the hot studs on tv.
Adam starts to feel the changes in his body. He groans in pain as his legs get longer and beefier. Standing at a height of 6'4", taller than his dad, Adam's shorts fly off as his quads become massive. His feet become massive as he feels the changes spread to his chest and torso. His shirt explodes as abs begin to develop across his stomach quickly joining in with two meaty pecs, giving Adam an incredible 8-pack. Adams feels his face start to change too. He feels his cheekbones get higher and his facial structure become more mature. A thin line of stubble appears across his sharp jaw.
Adam looks down at his amazing new buff body thinking the changes are over. Suddenly his groin feels warm and he sees the bulge in his compression shorts get bigger. The compression shorts stretch and stretch but eventually they can't take his massive cock anymore and they snap.
A naked Adam stands to his new height, both hands on his hard 11" cock and starts pumping. He knows he shouldn't but his mind is gone. Adam is now a hot hunky body builder who only cares about muscles and sex.
He turns and sees his dad still checking himself out in the living room, "Hey bro, you wanna help me with this," Adam says in a new deep baritone. His dad turns to him and removes his underwear revealing a cock that rivaled his sons. The both smiled and made their way to the sofa in the living room.
Adam runs his hands all over his dad's new chiseled chest, which turns them both on more. There was only one thing on their minds at this point, they both need to cum, badly.