Still in denial about what is happening to you, you remain in place, as your shoulders press harder into the shower's walls. The discomfort grows, and you attempts to step out of the shower, but you couldn't.
Your body continued to swell, as you tried to turn your body to get out, but the tiny shower stall wouldn't let you. The door out had blocked your ability to turn, because of the notches placed in them.
Your heart begins to race, as your body continued to swell, and your head pressed harder into the ceiling. You bent over the best you could, as your swelling shoulders swelled upward along the wall, and pressed harder into it.
Your mass continues to increase, as you felt your swelling leg muscles press against each other. The only limb that wasn't pressing into a wall uncomfortably was your penis and testicles, which continued to grow along with you.
The water continued to shower down onto your body, none of it reaching the drain, as it all was absorbed into you. Your left shoulder began to press into the shower head, as you try to adjust your growing mass to move away from it. You couldn't, and your shoulder pressed harder and harder into it. You left side had also begun to press into the shower nozzles.
You adjust as much as you could, as the tiles on the shower walls began to crack and break apart, making way for your swelling body. Your shoulder began to crack the shower head, eventually completely breaking it off, sending a larger stream of water onto you, causing you to swell faster.
You bend down the best you could, your head growing out of the shower, as the shower stall was almost completely filled with your muscular body. You had to start bending your knees as your legs lengthened, and your back began to press into the ceiling, along your shoulders.
Eventually, the nozzles broke off, and the left wall began to crack, snaping and crack the pipes behind it, causing more water to wash on you, increasing the growth.
You eventually had enough. As you had grown so much that your knees were now bent far enough that they were actually pressing into your swelling pectorals, as the shower walls crumbled around you. With one Massive push, you broke apart the entire shower, and got out, a mass amount of water finally hitting the drain, as you looked at the shower stall, which had been made twice as big from your growing mass.
You sat on the floor, as the growth ended almost instantly after you stepped out of the shower. Your head almost touching the 11 foot high ceiling while sitting. You had to be at least 20 feet tall, condensed in the bathroom. Your testicles sat comfortably on the ground, each as big as a basket ball, as your penis snaked across the ground, looking exactly like a snake, almost 4 feet long flaccid.
You were almost 9 feet wide across his shoulders, as you flexed in amazement of your new body, after the shock had worn off.
You realized what was going on. The water, for whatever reason, was making you grow.