Soon afterward, it was quitting time, and the workers in the office block were to return home.
Rob was the last to leave.
In the elevator, he thought that he could try his controlled transformation into a monster, and keep himself secret as a monster.
He turned the colour of his hair from brown to bright yellow.
He made his ears get bigger and pointed, and made his hands grow bigger too.
He made his clothes disappear, save for his vest and boxers.
He made his feet get bigger, and made his toes grow as long as his fingers.
His arms and legs grew longer, his fingers and toes gained claws, his head grew in size, and an extra pair of eyes grew on his forehead. Finally, his skin turned bright blue.
When the elevator reached the bottom, out came Rob, now completely a monster.
He exited the office block, and He strode around town, a monster man, in nothing but his human form's vest and underwear, carrying a briefcase.
The people in the city hardly noticed him; since he'd set his tf so that only he'd notice his changed body.
He admired himself in the reflection of a window. He looked really cool, and freaky.
And a quick dip of his hand down his boxers confirmed the absence of his penis. [he'd found out on the site that a person's private parts disappeared when they turned into monsters.]
Rob strutted through the town. It felt great to be a monster.