Cheetahs, as awesome as they were, were sprinters. Luckily for him, this was as sprint. He was panting and lounging on his side by the time she got back, looking rather gorgeous, if one appreciated big cats. His tail tapped the ground idly. In a moment, when he'd collected himself, he'd change back.
In the meantime he watched her with big, light-reflecting eyes, whiskers trembling, tongue lolling. Tee hee hee, he seemed to say, ears perked, paws stretched out in front of him.
In a minute or two the air sizzled again, and when he had regained his human form he was sitting on the dirt, naked, one leg up for modesty, covered in sweat and grinning like an idiot.
"I...win.." he panted, then reached for his boxers quickly. He snatched them toward him and stood up to get dressed.