Basically Jack and Cage start competing with each other for Mac’s attention. [It can be in a romantic way or a more general friendship-y way for either of them.]
Bonus points for an oblivious Mac.
Double bonus points for Riley and Bozer noticing and secretly encouraging it - they make teams {Team Jack v Team Cage}, takes bets, whatever.
Triple points if Matty gets involved.
(All the points if you want to add Mac/Murdoc with the assassin competing for his attention as well, albeit in his own screwed up way.)