(Giant and tiny) Flirtatious Crew

Zen is a plutonian soldier. The smallest of the many races among the stars. Plutonian often work with the Martian forces, whom, to them, are giants.
Even with their virtually same humanlike builds and armour, there is still a divide.
Zen has trouble feeling safe around the collosus, perhaps with good cause.
But, what will happen when a special intergalactic government program forces him to stay in extensive contact with a rather flirtatious Martian?