Seth felt pain in his stomach, and cringed. Didn't it say it was pain free? He smiled, though, as sillier scales seemed to emerge from his skin, starting at his arms and back, spreading outward. His face seemed to push outward, into a sharp point. His ears elongated into fin like appendages. His eyes turn orange/amber, and went into a permanent sly look.
His back ached as a fin burst out, growing until it was a foot long. His hands and fingers grew sharper, and a shark tail flung threw his pants. It was very long. Suddenly, his member grew, and reached one foot long, erecting itself. Seth gasped, and so did his friends.
" They did not say it would grow!" Seth gasps. Then moans. His cock seems like it's throbbing with lust, and he started to stroke it.
" Kris, let me fuck you.." Seth moans, his cock growing an inch. Kris looks shocked.
"You really shouldn't have drunk that.." Kris says. "It did THAT to you," he says, poking Seth's now one and a half foot long dick.
Seth gasps at the pleasure, and strokes harder, until pleasure over fills him, and he orgasms. Cum flies everywhere, and Kris and Devin yell.
"Stop it, Seth!" Devin cries.
Seth suddenly sees that he won't be able to hide his now two-foot-long dick in his pants.
"Devin, help me! It's still growing!" Seth bursts into tears, confused by pleasure and panic.
Suddenly, Seth's dick and ballsbursts with growth, growing and growing, until Devon and Kris are pushed away. Seth now has a three foot thick, and ten foot long dick. And balls the size of ovens. He is stuck to the floor, trapped by his huge cock.