"That feels amazing!" Ava finally managed to say. "Don't stop!"
Ethan complied and continued to rub Ava's ears. As he did, Ethan noticed something was changing about Eva's tail. He realized it was a short layer of hair spreading over the tail. The feel of Ava's ears began to change as the "fur" spread there as well. She was a brunette and the hair covering her body was blonde.
"I think you're getting more cat-like" warned Ethan.
"Huh?" replied Ava, only half hearing him and not really understanding. Then she saw the firm spreading down her arms and pulled away to examine herself closer. Ava found the hair had spread over most of her body, except her face, breasts, palms of her hands, bottoms of her feet, and a small area around her vagina. She ran her hands over her transformed body and marveled at her change, all the while feeling an unsatisfied need.
Ethan watched her in awe. "You were a sexy mermaid and you're one hot catgirl too!"
Ava pulled back the sheets to find Ethan fully erect. She climbed onto him, pressing her naked body against his, grinding their crotches together, and kissing him deeply.