If you see that kid taking advantage of the situation, tell them straight that it's unacceptable. Either get work done or get out! Dramatic - I know. but I'm a drama queen so yeahhh.
I've had people taking advantage of me but that's fine. It was a lesson learnt. Which is why I'm sharing this thought on this post. Looking at the brightside, I learnt a lot more from covering other people's share of work than I imagined. So yeay for me!
So if you know that one person who likes to slack and expect other people do their work for them. Remember, "either get your shit done or get out!"