This trophy is missable.
In the third phase of the fight, the track 'Snake Eater' will begin to play and the lifebars of Snake and Ocelot change to those used in Metal Gear Solid 3: Snake Eater.
During this phase Ocelot will occasionally attempt to grab Snake and put him in a headlock. A prompt will appear encouraging you to wiggle the left stick to break out of the hold. DON'T. Do nothing and after a brief period, Ocelot will kiss you on the cheek and the trophy will pop afterward.