6 year olds can't meaningfully consent. If it was shown then it'd be rape, pedophilia, etc. (Which is bad)
An adult member of sapient/sentient species--human, elf, dragonborn, devil, dragon, lizardfolk, halfling, or a elf temporarily transformed into a bear--can consent. That's the difference.
Elves, dragonborns, devils, dragons, lizardfolk and halflings are not real things.
But bears are.
What if it was an adult elf that transformed into a six year old - would it then be okay to show on screen?