my headcanon is not plausible so it's probs gonna get some hate, but i like it so much i don't care ¯\_(ツ)_/¯

so any kind of confinement/bondage triggers nick's trauma and makes him go savage for a while. nick and judy have been working at zpd for a few years and this has happened a bunch of times. in the beginning it freaked the other cops out, but when they realized judy is pretty good at handling it, they relaxed a bit about it. bogo especially was pretty iffy about the whole thing at first, but once nick became like part of the precinct family, bogo decided to turn a blind eye to it. they have a tendency to overlook certain misbehavior and mistakes from really good cops, and when officers have a skirmish, everyone prefer they hash it out instead of getting the higher-ups involved and possibly leading to someone being suspended or fired.