Nicky jumped back in the shower, barely waiting till he was in it before squirting more shampoo directly on his head. He barely even lathered it up, but this time he made sure to keep his eyes open and on his body. The thought of getting older excited him, he felt his cock stirring between his legs, something that had only started happening recently as it was, but it felt like it was in over drive. Experimentally he grabbed it, giving it a few strokes like he had once caught his brother doing. It made him gasp, just at the amazing feel of it.
The changes were starting again. He gained a few more inches in height and a few more pounds of muscle. His cock gained a bit more, the feel of it growing in his hands was amazing. He didn't know it, but he was well hung, probably only sixteen and he had a nine inch erection sticking out in front of him. His red pubes continued to spread as his treasure trail finally met his navel, then traveled a bit past it. Hairs started to grow around his nipples, and a few between his growing pecs. His arm hair was up to his elbows and his leg hair was creeping past his knees to his thighs. His beard also filled out more, his sideburns growing to meet his thickening goatee until he had a full scruff along his jaw.
He leaned back against the wall of the shower as he stroked himself, his body now edging itself past eighteen. His cock stopped growing as it hit the eleven inch mark, his brother had been popular with the girls at school, now he thought he knew why, if this monster was a family thing. His balls hung low and heavy, a nice coating of hair covering them. His height and weight seemed to grind to a stop, now standing six foot two, and a decent 185 pounds of muscle, now one could argue he wasn't a full grown man. The only growth that seemed to continue at all was his body hair. His thighs got a bit hairier, as well as a bit growing in on his tight ass. But it was truly noticeable on his torso. His treasure trail had thickened, a good three inch strip of dark red hair up his abs. The hair around his nipples had started to spread out, a diamond of similar hair between his pecs spreading to meet it, a light dusting of red across his broad chest. With a loud gasp he finally came, shooting his first load across the tiled wall of the shower.
He ducked his head under the stream, letting the water wash out the shampoo before his growth went any further. He stepped out and shut off the water before going over to the mirror. What he saw made him smile, he was older than his brother now, maybe twenty one years old, and a hunk. A square jaw, with a scruffy red beard and his shaggy read hair atop his head. His body was toned and athletic, and looked so manly with all that hair across it. Staring at himself he felt his monster cock stirring again. "Nice.." He rubbed his chin as he heard his deep rich voice, saying a few more words just to hear it.
He quickly toweled off and ran into his room, stumbling a few times as he got used to his bigger body. As he opened his closet he suddenly realized nothing in here would fit him, so he made a beeline instead for his older brother, or was it younger now, Rick's room. He had left some clothes behind when he left for college, and Nicky scanned through them till he found some he liked. The tank top was a little tight, the thought of being bigger than his brother made him giddy. And the cargo shorts did little to hide his bulge, which didn't bother him in the least. Slipping on a pair of old sandals, he looked himself over in the mirror with yet another approving grin, but then it hit him. His mother would never believe it was him. He might be able to pass himself off as Rick, but that still left where Nicky had gone a mystery, not to mention until the real Rick showed up. He needed to get away to think, he grabbed his back pack, and without really thinking about it he shoved the shampoo inside along with a few of Rick's other clothes.
He had a club house out in the woods with his friend Marcus, he could hide out there for a bit while he thought it out. He snuck out the window the same way his brother did all throughout high school and set off for the woods.