Ghost | Transferable tattoos

Simon was lying on the couch in the living room and sleeping, relaxing after work. He was lying on his stomach, so you had full access to his back. You were bored, and at one point you came up with an idea. You had a lot of transfer tattoos with children's drawings, and you wanted to paste them over a Ghost. After a while, your work was finished, and Simon's entire back was covered with various colorful drawings. But soon he woke up, and opening his eyes, he looked sleepily at you
"What are you doing?"