twist (someone) around (one's) (little) finger
To gain complete control or dominance over someone; to make someone do whatever one wishes. The spoiled little brat has completely twisted his parents around his little finger. Everyone jealously accused her of twisting the boss around her finger.
twist/wind/wrap somebody around/round your little ˈfinger
(informal) be able to persuade or influence somebody very easily, usually because they like you: I can twist my parents round my little finger.