When Bobbi shapeshifts, she concentrates on the form she wants to adopt and then reshuffles her molecules, 'scrunching' them into the desired shape. It can take quite a bit of work sometimes. So she was delighted to discover a little reflex 'scrunch' she could make happen with a minimum of effort. She was experimenting with gently 'scrunching' simple tattoos onto her skin, when she noticed her body responding to the subject of the images she was creating. Now, when she doesn't want to go to the trouble of 'scrunching' her entire body, she'll create one of these basic tattoo designs and enjoy the effect it has on her...
This first Tattoo Scrunch is by the brilliant Numitorus Check out his DeviantArt page here.