Quickly undressing, you take a moment to appreciate Lydia's body bend over the bed. You run your hand down her tail and caress her ass that you have so long wanted to see.
"Please..." Lydia pleads "Don't wait any longer. I need to feel you inside me." Underscoring the point, she presses her backside against you and you can feel her wetness against the tip of your penis.
You oblige and slide into her, drawing a mewl of pleasure. You start thrusting and soon you notice short yellow and black hair spreading across Lydia's body, forming the splotchy pattern of a cheetah.
Lydia dug her nails into the bed then realized they were becoming claws. Why had she waited so long to have sex? This was amazing! She saw the fur spreading down her arms. She didn't understand why she was becoming a cheetah catgirl but she liked it.
You could feel the fur on Lydia's legs against yours and see the fur now covering seemingly every inch of her body. Watching Lydia transform as you fucked her was pushing you toward climax. If you pulled out now would her transformation stop? Would she eventually return to normal? If you kept going would she be like this permanently? You realize you want that...but what did she want?
"I'm almost there..." you warn. "Should I..."
Lydia understood instinctively. "Cum inside me, my mate. I want to be like this forever."
You thrust as deep as you can and climax. Lydia lets out a caterwaul and you feel her shudder with an orgasm.
When you finally slide out, you collapse on the bed, exhausted. Lydia nuzzles up against you. "Thank you, lover." You can hear her purring.