My favorite compression is the Hot Wing (or at least that's what I was taught it was called). It's where you go for a Kimura but they defend, so you shoot the arm that grabs your own wrist through and grabs your right tricep, then your right arm loops around and under the guy's arm and grabs your other tricep, From there you just walk around and turn & crank like a regular kimura.
I'm a big fan of using the triangle position to maintain control and set moves up (whether it is off of a sprawl, side control, etc). So usually when I get a reverse mounted triangle, I'll start going for the kimura, if I can't get that I'll hit the "hot wing."
A lot of people say compression locks are purely pain moves but I accidentally fractured a kid's forearm once with it
, so everyone be smart and tap instead of risking an accident.