Riana just takes him into the room and puts the hat on his head.
"Hmm you're laid back and intelligient but somewhat clumsy." The hat says, "Stripetail!"
Luke's hair grows to his butt which expands in size. His face becomes short feminine and hairless and the rest of his body follows. His chest grows a pair of D-cup breasts. His waist thins and his hips expand. His front is suddenly flat. Her clothes change into a black uniform with a yellow bow. She becomes calm and comfortable in her new body. She is now Lillian
