You'd never know it by looking at the two of them. They kept it well hidden and discreet, not wanting the sigma attached with how it was or wanting to answer questions and be treated any different. Yet still it was there, that soft leather black collar that locked on with a key only one of them had. Master and sub.
Lassiter is the kid of guy that likes order, his world is made up of rules that keep his affairs in order and dictate his reactions to those around him. The walls he's built have done him well over the years, he's successful, respected maybe not as well liked as he hoped but he knows that's part of doing his job so well.
Shawn on the other hand is a loose cannon. His main goal in life is to strain and push every rule that anyone has ever laid out, the feeling of freedom is one he never wants to give up. In his own way having over 50 jobs and being able to get up and go, gives him a rush. He's completely in control and he reveals in the knowledge.
No even thinks twice anymore when Shawn shows up to the precinct to tease Lassiter who barely manages to keep all his walls intact after Shawn blows by. It's their 'thing' Shawn pushes Lassiter and Lassiter does his best to ignore him. No one thinks it's anymore then that or notices how Santa Barbara's head detective starts to finger the neck line of his pressed suit once Shawn finally leaves.
Once the sun has set and most of the lights are off in the precinct and the Psych office has closed for the night no one in their right mind would place the two of them together. If they did it would only be logical to assume Lassiter would be the one on top. They'd also be dead wrong as its Shawn who's leaning against the kitchen counter of Lassiters' new house. Fingers carding black hair as they urge Lassiter on, who's on his knees in front of Shawn, doing his best to suck all of the younger man cock down his throat with his hands cuffed behind his back.
He's not wearing much else except those cuffs and that shiny black collar, its how Shawn ordered him to be for when he got there that night. And Shawn's going to make sure by the end of the night Lassiter gets a reward for doing just as he ordered, once he's done letting Lassiter give him the blow job of his life anyways, which isn't going to take long if Lassiter does that trick with his tongue again.