I'm thinking of filming my cousin changing in the bathroom
Whoa, are you serious right now? Isn't that illegal and immoral?
I think it can be a funny idea to take a video of her.
You can end up in a lot of trouble when someone finds out. That is considered sexual in nature.
I won't tell anyone, she won't know. She's still a kid and doesn't know anything.
Now that I know she is a kid, this is not only illegal and immoral but also considered pedophilia. You could go to jail for a very long time if you attempt to pull off this "joke."