Rick stared at himself in the mirror, transfixed by the effects his concoction had on his body. His cock began to throb harder, begging to be stroked. Without even realizing it consciously, Rick reached down and began to stroke himself.
The itching intensified, and became more of a burning. Rick jumped, startled at the glow in his reflection's eyes, which had become undeniably luminous. He tried to make himself stop stroking, but couldn't, despite the fact he was willing himself to stop.
He began to stroke faster, watching his reflection's face begin to stretch into a muzzle and his ears grow long and pointed. His body, unused to such sensations, throbbed mightily and shuddered as it began to conform to a new set of dna instructions.
A few minutes later, the transformation was complete. There was no more "Rick", only a half-man, half-wolf creature standing in the basement. It finishd servicing its needs, and collapsed onto the basement floor with a howl.
Rick woke up five minutes later, drenched in sweat and naked. His body had lost all of the hair it had gained. "Amazing," thought Rick. "After all of these years, I've finally done it! To think, I have that bastard stepson of mine to thank for it!"
Getting up, he carefully avoided the pink mist, which was still hanging in the air. He went over to his supply cabinet, and grabbed a face mask, designed to keep from inhaling fumes. He collected as much of the mist as he could into several beakers, and distilling the mist into a liquid form, making careful note of the chemical composition.
He could hardly contain his arousal, even simply being around the mist. For years, he'd toiled in secret, looking for the solution of how to create the lycanthropic condition! From what he had learned from various ancient texts, and what he knew of chemicals, he could now regulate the strength of the formula.
He heard his wife Tabitha call down from the kitchen,"Honey, dinner's ready!"
"I'll be there in a minute, sweetheart," he called back, smiling broadly.
He carefully sealed the containers of the fluid, and set a new batch to simmer. He had many more experiments to do with it, and he knew tonight would be a busy one.