My first thought is that it's either a hoax or a sting. Surely even pedophiles are smart enough not to solicit procurement at random! Although you didn't say whether he is a previous client, or even whether you knew that or not; if he is, he may have convinced himself since you saw him that you got on so well you'd do anything for him.
My second thought is not to snitch - that's my automatic reaction to this sort of thing. Nobody's actually hurt you or your interests; you don't even know whether the request is genuine ... why get involved? If the cops wanted you in uniform, they'd pay you a salary.
My third thought is that you may perhaps have very strong feelings on the matter (as an extreme example, I know some people who start thinking 'pedophile' if you so much as smile at kids playing on the street!) - and/or perhaps the eMail was more graphic and disturbing than you've summarized here.
My fourth thought is that forwarding the information might be worth some brownie points, which might come in handy at some time in the future. Venal, I know, and the sort of thing that prompted my second thought, but every now and then we all need a favour. Do you have any unofficial contacts with LE to whom you could pass this?
All in all (and subject to what was actually in the eMail and whether you know the quy!), I'll bet a nickel it's either a hoax or sting...or even a reporter preparing an expose of 'Toronto, the new city of the plain!'. But it's really something you have to make your own decision on and I can only hope the above helps you clarify the issues.
But gracious heavens, I've just had four thoughts in one day! I need to lie down and rest now!