that she has taken my mag without even asking

[mrsout]

And I havent even read it yet! Got it out of my bag, put it on my desk, but been too busy to read it. My collegue next to me just picked it up and is now showing me photos. I HATE people reading my magazines before me!

So tell her you want it back now then ...

Oh so do I.

YANBU

Make her give it back!

I would say, can I have that back now, i haven't read it yet.

Tell her, not us!

Or just keep it in your bag in future.
Tell her you're saving it for later.
Then swat her with it.