do (one's) bidding
To do what someone else wants or has requested, to the point of servitude. I hate how my mother always wants me to do her bidding—I refuse to do what she wants any longer! I can always get Tom to do my bidding, which is great when I'm faced with something I don't want to do!
do someone's bidding
to do what is requested. The servant grumbled but did his employer's bidding. Am I expected to do your bidding whenever you ask?