His version is completely credible. Her version is implausible, considering the pain involved in getting the work done.
He denies that she was drugged and from what is reported in the story, she makes no claim to being drugged. Even without the pain, her falling asleep during the procedure doesn't make any sense. I'd expect that its not one of those humdrum, relaxing events that makes a person nod off when its happening. Maybe if you could find a few other people that slept through getting tattoos, I might change my mind. Short of that, I'm not aware of ANY support for her version of events.
Never have received tattoo other than my upper arms but I nearly fell asleep while getting my tat on my left arm. After awhile the pain was numbing and it didn’t bother me that much.