what is your goddamn purpose woman

is anyone else kind of weirded-out by and wary of Yukino?

Because I am. 

I am so confused as to her actual status.

Like, if she’s a sergeant or whatever, then htf is she not like, held prisoner or whatever by the main people since she’s a celestial mage? Like, wut? And why would she offer her keys to Lucy in the beginning? Why join Sabertooth? wtf is the master guy she refers to?