Barbie got hit with a magic anon on tumblr. Turned her into a kid with no memory past age seven. She was wandering the city and Rex's girlfriend found her and took her back to Rex. He's not good with kids but he really cares for her so he puts up with it. Here she wanted his attention and ended up falling asleep instead.

Phideux Rex © Mgann Martian
Barbie and art © Sara Standish 2014
((also their species allow them to cling to things similar to monkeys and gorillas. Thats why she's not falling off while she sleeps.))