Shin was a hustling street mechanic who tried to con Jake/Jay, a gang member, and Jay ended up becoming obsessed (in a healthy way) with shin. Reluctantly, shin decided to date(?) Jay bc he takes good care of him. He got him a legal gig in a mechanic shop and pampered him with a nice car, saved him a few times from certain death... so shin eventually let him move into his apartment and everything.
Turns out, Jay isn't a gang member, he's a special ops agent working deep undercover for the CIA and when Jake finds out it isn't who he says he is, he gets upset and pretty much runs away(also for his safety bc of a deal gone wrong) and of course Daddy Jake finds(stalks) him and keeps an eye on him to make sure he's safe.
Something ended up happening with shin and his brother and he called Jake for assistance. They clean up the mess and screw and Jake tells him what his job is. Shin says he doesn't trust him, but if he wanted to gain his trust, to let him in on his operation. Now daddy jake is teaching him how to shoot.
Obviously there are a bunch of smaller details I left out but that's pretty much the gist of it

Some mighty stranger...please explain me the plot...I have no idea what is going on. I am only here to see their bare ass fucking each other senseless.