get in with (someone)
To be or become involved or associated with a person or group of people; to be or become popular or friendly with a person or group of people. I'm worried about Anne—I think she's gotten in with a rough crowd. Experience like that is sure to help you get in with the board of directors.
get in with
Become involved or associated with, as in She got in with the right crowd, or These loans got me in deeper and deeper with the bank. [Late 1600s]