Instead of Stick, Matt was trained by a world-class retired/rogue spy who trained Matt in all the ways of espionage. They stay with Matt for longer than Stick did, and ends up becoming the closest thing Matt has to a parental figure. So when this person is killed by a group of rival spies, Matt knows that he has to bring that group down by any means necessary--short of killing, because Matt has still never been able to wrap his mind around that. He vows to tear the inside out. Soon enough, he finds his in--the leader's lonely son, Foggy.

Tl;dr: Spy!Matt seduces Born-into-a-Mob-Family!Foggy for revenge.