Robert knew what animal he wanted to be. Ever since he was a kid, werewolves fascinated him- he loved the idea of humans being able to turn into wild beasts. It had made him curious about real wolves, and the more he'd read the more he'd known he wanted to be a lone wolf.
He set the Chronivac to Wolf and clicked Change. Instantly he felt his body start to reshape accordingly, and unlike in those werewolf stories he'd read the change didn't hurt, but just felt intensely weird and pleasurable. His bones, muscles and skin convulsed as they shifted around, and as he looked at his reflection he saw his ears shift to the top of his head, his face push into a snout and his teeth sharpen into a carnivorous form. He felt his body slim and shrink to lupine proportions, loving how his muscles seemed more lithe and strong. He looked at one hand and smiled as was stripped of its human dextrosity- pads formed on its surface, the nails firmed into sharp claws, the opposable thumb vanished and it formed into a foot.
A twinge in his back alerted him to the next change, and he smiled as he saw his tailbone expanding outwards, a tail bursting forth from it and wagging almost beyond his control. A prickling sensation erupted all over his skin, and he saw thick hair- not even hair, he realised, fur- sprout over every inch of him, pink flesh covered by thick brown needles.
With an audible crackling, the joints in his arms, legs and spine shifted, pushing him onto all fours. He looked over his body and realised even his penis was transforming- the phallus became more pointed, and more sensitive at the base as its knot formed, while the skin around it thickened and firmed to form a sheath.
The wolf didn't even remember what his name as a human had been, nor did he care. He was more than ready to leap out the open window of this weird human place and run away, but before he could a little surprise hit him...