[ The coughing fit instantly turns Akko sheepish. The dust IS pretty bad and she'd made a significant dent in it already but...well. Obviously there's a long way to go. ]

Eheheh...sorry, I only started cleaning recently.

[ Then she got bored and practiced magic instead. But she doesn't say that because "I got bored" is not very flattering, Akko thinks. ]

I guess I wouldn't mind help, if you're willing to offer it. You can pick some of the books to sell at your shop if you want! As a sort of payment!

[ After all, she wouldn't ask for help and offer nothing in return. The books could be valuable, too - they're old and full of arcane knowledge probably. ]