"Hang on, Sam. I don't want to waste my turn. I want to make sure that this idea works. I don't know if time limits are part of the rules," Jen said, walking to the refrigerator, grabbing the last can of Coke. Looking across the room to Sam, Jen smiled, asking him, "Are you ready?"
Sam simply smiled at her, his cock rising to attention. A familiar dreamy look had come across his face and stubble had started to sprout on his chin. Jen tilted the can back and gulped.
It felt like she was drinking liquid fire as the coke washed down her throat, and the change came quicker than it had with her previous trigger.
With the first swallow, dagger claws ripped out from her nail beds, and her teeth grew into fangs. Fur grew quickly from her crotch, accompanied by her first orgasm. Jen gasped in shock, then pounded the drink down her throat.
Tossing the empty can down, she succumbed to the change, a willing participant once more. Her face stretched into a muzzle with an abrupt "snap!" sound, and her spine bowed as she dropped to all fours.
Her tail had barely blossomed when Sam entered her from behind, his feral snarling telling her of his lust in the language of the lupine. He took her roughly, savagely pounding his member in her until he erupted, sliding out of her.
The Jen-wolf howled her satisfaction, turning to face her mate, but recoiling in confusion at seeing him on the floor shuddering. His fur was receding and he was...becoming human?
The Jen-wolf didn't understand, having never seen the change happen. Only the Jen side of her had, and it was quite sublimated.
(Sublimated for the next 45 minutes to be precise.)