Well... I state on my website that if anyone wants a bigger scan, just email me. But then, they're all fancels. I do the same thing with all my sketches and stuff because hey, if someone wants to make a skin/desktop/shirt/etc with one of my pics I'm happilly flattered.
But then, that's usually for just one pic. And they certainly aren't expensive collectors items. My guess is the person probably isn't too into cels and might just be looking at them in the same way they'd be looking at any series image gallery. Just because they ASKED probably cuts down on a lot of the illegal possibilities.
So yeah... it's weird, but you probably don't need to be too worried
