The thirteen-year-old girl is coming back home from school, on foot.
There's a cat following her. It's been following her for a while, but from a distance.
She decides to be friendly. She stops and turns around to look at it. It stops as well. "Mow?"
The girl's face—changes. It's still a human face, mostly, but now there's something different about it. More feline than anything. Whiskers grow, her pupils dilate and her eyes get a bit rounder, her bones move under her skin, their shape changing a bit. "Mew," she says, vocal apparatus having changed a bit, apparently.
The cat blinks and approaches cautiously. "Moow...?"
She doesn't giggle, but she feels like giggling. She's talking to a kitty! Well, kinda talking to a kitty, it's not like she can understand kitty-speech. But still! "Maw!"