What kind of help do I need?

Well, lots, but today I mostly have one question. I don't know if anyone will be able to (or wants to) help me, but I couldn't think of anywhere else to put this.

For a school assignment this summer, my sister has to read 100 hours. She's really hesitant and I'm really competitive, so I challenged her to see who could get to 100 hours first. So, whoever wins the challenge first gets a prize. I don't really care if I win (honestly, I only did it to help her reach her hundred hours), but I thought a prize would be neat.

But help - cause I can't think of anything good for a prize!

Edit: I should probably say that my younger sister is 12 and I'm almost 18.

HeronW said:

Loser hosts a video fun night--2 movies of the winner's choice, brings snacks and cleans up after unless winner feels magnanimous and decides to help!

Loser helps winner rearrange her room: move stuff, paint.

Click to expand...

I love this first idea, but see the thing is, that would only work if I throw the competition so she works for sure, because the movies I like to watch she's not allowed to watch.

But the second one has potential.

Lol, I like Unique's idea too, though we don't have a treehouse

And I don't like baloney or spicy mustard - and I'm sure she doesn't either, but I really like all the suggestions lol