Little ball of fur.
Purr, purr, purr.
You have already met two of my children, Jet and Onyx. They both spent all day sleeping after playing with my 4 year old, kind-of nephew. He raced cars around a track with the kittens. They chased the cars around and around and eventually fell asleep from kitty-play-exhaustion. Unfortunately, Onyx woke up as I got closer to take a photo so I was only able to get a photo of Jet sleeping in the track.
Jet asleep after a hard days play.