Gallavich

Gallavich  is the slash ship between Ian Gallagher and Mickey Milkovich from the Shameless fandom.

Canon
In the first and second seasons, Ian and Mickey were just having sex, and there's not much of that in those seasons.

In season three, Ian begins to get jealous that Mickey sleeps with girls. In the following episodes ian starts dating an older man in the episode May I Trim Your Hedges? Mickey is jealous of Ian and beats Ian's date. In The Sins of My Caretaker Ian is getting ready for military school and Mickey helps him, Mickey asks what Ian sees in the old man Ian sees. Ian replies: "he buys me things, orders room service, is not afraid to kiss me." in the same episode Mickey kisses Ian for the first time before robbing some house.