The thing is though, and I'm not being hysterical, but simply factual, there is, statistically and approximately, a paedo round every corner. It's very common indeed. The chances of this bloke being not entirely innocent are not remote and infinitesimal. Not at all.
It's being aware of what's inappropriate, and being able to admit if something makes you feel uncomfortable and step in, that has transformed the experience of abused children from just a few decades ago – so that now they are listened to, and steps are taken to protect them, and convictions are made.
"Refreshing" New Zealand has an extremely poor record for child abuse. Perhaps not being bothered and not looking out for kids and being super-relaxed has something to do with it.
I'm a bit
at the response "Oh not every man is a paedophile you know!!! That nice man who hangs around the playground is totally innocent, he just likes children!!!" Not every man is a paedophile, but there are a lot of them, and inappropriate behaviour around children, and putting pressure on children to do what the man wants, can indicate something's up.
I understand that in this case we don't know if the man who's asked, it might be just his aunt who's asked. But if it makes OP uncomfortable, it's OK to listen to that.
In a photo session with a parent present, no, a man cannot do anything. But it doesn't just work like that. I'm not saying this man is dangerous, but if he was, this would work by gaining trust, getting to know the child, maybe then being around when the aunt babysits, maybe being left in sole charge for a minute or two while she goes to the toilet. And so on.
I repeat I am NOT saying "He must be a paedophile!" I'm saying that finding this request slightly uncomfortable is understandable, and that thinking he might be dodgy is a reasonable possibility, not outlandish and ridiculous.
I know I'll get flamed for over-reacting but for either the man or his aunt to apply emotional blackmail for him to do stuff with a small child he doesn't know, rings a faint alarm bell with me. It's possible to act on that calmly, without pitchforks, just listening to your instincts and saying no if that's what you want to do.