Well, we don't see DMs except if they are reported, so if you don't report us the repost (and I don't see why you would since you gave the permission), yeah nothing happens.
I don't see why we would ban someone in a situation like this anyway, since you gave your permission. ^^'
You have to manually copy/paste to repost a DM, though, but as long as you have the permission of the OP I don't see why you couldn't do it.
I hope I answered your question.