As Henry thrust away on Joanna he could feel pressure at the base of his spine. That must mean a tail. The fur coat gripped his body snuggly, like being wrapped up in a favorite blanket. His dick felt fantastic and by the sounds Joanna was making she was enjoying the sex even more than him. Then she abruptly out a new sound, clearly more pain than pleasure. Henry only had a moment to realize he'd accidentally sank his new claws into Joanna's shoulder. Her body tensed for a moment and that set Henry off, pumping himself into Joanna, who let out an long animalistic scream and orgasmed as well.
"Oh yes...fuck...this is fantastic..." she managed.
As his dick stopped quivering, he looked down to see stripes and fur spreading over Joanna's back. It reminded him of the coat.
The two feline lovers collapsed on the floor and it was several minutes before Henry could pull out. He slumped against the bed, feeling exhausted. Joanna crawled over to him, her tail dancing happily in the air. She rubbed her head against his hairy chest and purred. Henry's eyes and hands roamed over Joanna's body as she snuggled against him and found she was anthro tiger from the neck down. He decided to take off the coat, unsure if that was even possible. He removed it with great difficulty, finding everything it had covered was now tiger fur. From crotch to shoulders he too was essentially an anthro tiger, and the fur seemed to be slowly working its way down his legs too.
"I'd offer you your coat back, but I guess you don't need it anymore" said Henry.
Joanna just purred.