Working on same git repo on two computers

I'm facing a problem that I'm trying to solve on the best possible way. I'm working on a project and it's hosted on GitHub. I have a desktop computer (home) and laptop that I get to work. When I'm home sometimes I just want to switch from one to another. There's virtualbox machine that keeps all configuration and services (nginx, mysql etc.).

My question is - if I put working directory on my dropbox/onecloud, what would happen? I know the file changes will be synced between two computers but I'm not sure what will happen with GIT repository there and is it even possible to keep virtualbox machine files on onecloud/dropbox ?

What are your thoughts? I know I can just push/pull every time I switch computers but I'm looking for a solution that thinks my two computers are actually single GIT repository?

So if I'm bored in my desktop chair and want to switch to a sofa with laptop - what would be best way to keep source code and VM in sync ?

Thanks!