Hypothetical question About babying a 26 year old man.?

My friend he's 26 and he asked me if I'd baby him for a few nights. As far as I know he's not an adult baby. I think that he just wants to experiment with this thing. He asked for the full baby treatment Nappies (diapers), dummy (pacifier) you know full baby treatment at the time I said that I'd think about it. We both live in Australia and anyway I'm not sure if I should or not so I was wondering if someone asked you to do that for them if you would or not even if you were a complete stranger? I want to say yes but I don't know. He is a nice guy and all I'm also 26.