It's entirely possible Eames' traitorous heart has waited until precisely this kind of moment to blindside him. Arthur—beautiful, competent, untouchable Arthur—seems human and vulnerable stretched out on Eames' sofa beneath his grandmother's afghan, and Eames experiences a rush of feeling for Arthur so strong it stops him in his trainers. He fully expects to find skid marks when he looks down.
Arthur and Eames have always had an arrangement of sorts: Eames goes to Arthur when he's in trouble, and Arthur doesn't get in trouble. But when Arthur starts turning up at Eames' door with mysterious injuries everything changes.