Any Android Apps that can group books?

Hi,

So I'm looking for an eBook reader app that has 2 main features:

1) The ability to upload books to a website or central location that they can then download to an Android tablet (e.g. Google Play Books).

2) The ability to organize/group books together so I can organize them by subject matter, series, etc so I don't just have one giant location with all the books mashed together.

I have a tablet for my kids and I want to be able to get books for them and upload them somewhere so the books just show up on their devices. Even if I have to rig something up with a Dropbox share or something like that it'd work.

I used to do this with the Amazon App but had to use a dropbox sync utility. I currently do it with Google Play Books which is awesome but can't do any organizing of the books.

Are there any apps that do let you do that?

Thanks.