twist someone around your little finger idiom (UK also twist someone round your little finger)
任意摆布，任意左右（通常指十分喜欢自己的人）
to be able to persuade someone to do anything you want, usually because they like you so much
He'd do anything for you. You've got him twisted around your little finger. 他会为你做一切。你已经完全可以左右他。