Not long at all

Almost as soon as the clatter of the machine ceases you hear Steve's key in the lock. Hastily, you pull the top sheet of paper free and tuck it in your pocket as the door swings open.

"Alright mate," you great him as casually as you can manage "what's occurring?"

Steve replies with a noncommittal shrug carefully avoiding meeting you eye as he busies himself clearing away last nights discarded pizza boxes. You take the opportunity to study him looking for signs of his change. The first thing you notice is how tired he looks. Pale and drawn, hollow eyed without even enough energy to yell at your lazy arse for not bothering to clean. Clearly he hasn't been sleeping and you feel a small pang of guilt for putting him through the emotional wringer for your amusement. You push your conscious aside focusing on what you can seen of his physical transformation for now.

He's lost weight and his face is thinner, his features softer and more delicate. His baggy clothes mostly hide his developing figure but there's a telltale sway to his hips when he walks and the seat of his trousers pulls tighter than it should when he bends. Your new typewriter really has changed him. Your enhanced cock stirs at the thought of the power you now wield. You can't wait to see more of your handy work.

"So, it seems like there's something on your mind Steve," you say "Do you want to talk about it?"