Ah bugger I asked my Supervisor and she said I can go for it and work for two stores but she doesn't really like it. I'm gonna decide to not work for 2 stores cause she's a lovely person and I don't really wanna inconvenience her. Plus, running a store must be hard and I don't wanna add anymore stress haha.
EDIT: Just went back in store and spoke with her again about working in a couple of departments and she said that's a much better idea so she called someone else and said that I'm free to work for them and she's fine with it. That's pretty damn great to hear
Thanks for the advice y'all!