With every thrust, every grunt, evey clumsy paw-grab at her broad, panda-like torso, a Mary felt a thrill, an ecstasy unlike any other she had felt before. It was more than just the sex, it was more than just the wild, reckless abandon of mating with a male she barely knew, and it was more than simply the fact of how good he felt inside of her. On some level, this felt right, it felt important. It felt like being here, mating with this other panda, was doing something of value.
The two were so engrossed in each other, they hardly noticed their changes inching along at a slow, deliberate pace. The potions they had consumed were the beginning, an introduction of sorts. This was how the story continued.
After a solid twenty minutes, far longer than either had previously managed as humans, they dismounted, breathing heavily in exhaustion. They had done it, accomplished something great, they were each independently sure of it.
"On behalf of Magicorp, we would like to thank you for participating in this program," an ethereal voice said, reverberating in the room and startling the pandas out of their post-coital stupor.
"We strongly encourage you to continue mating, and to locate the bamboo plants that are now growing in your apartments. You will need both as you continue you along your journey to a new species."