wrap around one's finger

wrap sb around one's finger AND twist sb around one's (little) finger (to have control over somebody, to be able to persuade somebody to do anything to your liking) — веревки вить из кого-л.; всецело подчинить кого-л.

Example: The boy had such a weak will that I was able to wrap him around my finger in an instant.

Related vocabulary:

[in the palm of one's hand]
[walk all over sb]
[lead by the nose]
[feed out of one's hand]
[under one's thumb]
[веревки вить]
[держать на коротком поводке]