It's just, wouldn't it be a bit hard to eat with flippers? Or really to do most things. But then, I suppose you'd have the same difficulty if you magically removed thumbs. Hmm... I can understand why you picked flippers but if Draco's not got his memories any way (which I think you imply) does he actually need to not have hands?

Don't mind me, I'm just curious. It's the one bit of your plot that really sticks out for me. Everything else seems believeable, just not that. Anyway, it's just my opinion and you're welcome to disgard it. Heck, you'll probably make it believeable within the text.