How about a lioness!
Good choice honey, I'll make sure you see what having a lioness as your girlfriend is like.
Well in that case I will be a black panther anthro. I can't let you have all that fun on your own...
They pay for the potions and head home...
After they get they start to furiously make out, but before they go any further she reminds him of his desire to have a lioness.
He stops and she grabs the vial. Then she drinks it while standing on him in their bedroom. After a few seconds they continue their make out session as her transformation started to begin.
As they were kissing he started to feel her head elongating and at the same time stretching giving it a more sexy feel. Her mouth also started to elongate and as it did he had to constantly adjust to her mouth expanding which made him all the hornier. At some point he was even able to feel her growing canines with his tongue. This was too much for his as he was almost ready to cum from this alone and her body becoming furrier. He needed a break but she wasn't having it as she roared at him while simultaneously showing off her very long canines.
As she did so he started to inspect her face with his hands feeling her fuzzy ears and her long muzzle which ended in a wet nose and the most majestic pair of canines he had ever seen. He was actively inspecting her teeth when she suddenly closed her mouth and said: I can do whatever I want to you now as she brought her tail up to his face making it hover just slightly above his head and a bit to the right.
As he was inspecting her face which he found mesmerizing , the changes progressed at a staggering rate making her body more muscular and completing her tail which had a small amount of black hair at the end.
He started to feel her getting uncomfortable in her current position as her legs lengthened from her heels down replacing them with strong tendons allowing her to walk on her pads, these pads
also came with a pair of deadly sharp retractable claws.
Sporting these claws on her legs aswell allowed her to start experimenting with retracting them in order not to scratch the floor.
After she started walking around on her new legs she felt comfortable to walk to the hall to bring me my vial.
As she was bringing the vial to him she opened the cap with one of her canines while at the same time waking in the most imposing way she could with her tail swinging behind her.
Drink up, now its my turn to have fun....