Mike blushed. "Can I be Batgirl?" he asked, as his friends looked at him in surprise.
Kathryn smiled. "Well of course!"
Mike's skinny, teenage male figure began to take on curves as two small mounds grew on his chest. His t-shirt and jeans changed to a bat-costume, complete with utility belt and batarangs. His muscles remained hard but were not quite as conspicuous on her lean, athletic frame.
"Thank you, thank you" Mike weeped tears of joy.