Furry Bum

Sometimes Willow likes to face the wall (it's a cat-thing) (not that this 'explanation' makes it any less weird), which allows for a magnificently close-up view of her wondrously beautiful, and quite fluffy, posterior.

She seems a little displeased.

"Excuse me! Desist NOW from photographing my bottom, infantile human, or you will experience the full force of my feline fury."

Cat alliteration is the best alliteration.