putty in (one's) hands

Easy to control or bend to one's wishes. (Putty is a very malleable material.) Oh, come on, Julia is putty in our hands—we can definitely get her to help us with this prank.

putty in your hands

If someone is putty in your hands, they will do anything you ask them to do. Simon proved to be putty in his hands. I was completely in awe of him — I was putty in his hands. Note: You can also just say that someone is putty. Sometimes he'd do something like bring her a box of chocolates and she would be putty for a week. Note: Putty is a thick paste that is used to fix sheets of glass into window frames.