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Source: https://writers.stackexchange.com/a/28961
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

Source: https://writers.stackexchange.com/a/28961
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

I was writing a similar story once. Building romance is not the easiest of things, so I feel you.

I'd say that you have to put yourself in their shoes. Think of the most interesting or probable way of making the relationship happen. Personality, background, social context and situational events all matter.

It also depends on how much their relationship "fits" inside your plot. Does the main story revolve around their relationship, or is it something that happens on the side? The first is more likely, since you mentioned they both are main characters, but still this point holds.

If it's important for the plot (both in terms of story and character developmetn), consider that you will have more "time" to show how their relationship develop - from being simple acquaintances to slowly becoming something more. If it's not your main focus, you can probably skip some minor steps for the sake of brevity (carefully thought, since this may leave the reader with that kind of "what-happened" feeling).

**Personality:**

Maybe the obvious point here. I'll just add that people tend to behave differently in different contexts, so even your no-nonsense war captain may enjoy hugs in his private sphere - or some other form of showing affection. There must be something in your MC behavior that will arouse interest in the other. It doesn't have to be sexual or romantic interest at first - it could be just curiosity, irony, even disdain.

Being two different species, maybe there are some prejudices on the table. Maybe they both have incorrect or partial information on the other, and they start to understand how those ideas are wrong. Typical sentence: "_You're funny/brave/strong/smart for a human/alien race here_". From your alien POV, the human female may be interesting because she seems unpredictable (you mentioned how she plays naive, but can stand her ground fiercely).

**Background:**

Another pretty obvious one. There must be reasons why both characters aren't already engaged (with a member of their own kind, also). At least for us humans, our background of romantic interactions weighs on the present, so you may want to take it into account. Maybe one of your character is so fed up with failed relationships that he/she has stopped trying meeting possible partners altogether. Maybe the other MC reminds them of someone they used to know and admire.

In the story I was writing, my male character had lost his childhood girlfriend in a terrorist attack, and that - of course - changed his way of dealing with people even planets away from Earth. Maybe that's too extreme - you don't have to bring the big guns here, if they are not needed: but you probably already have your MC's backstory sketched out, so look at it for ideas.

TL,DR: there may be interesting "hooks" for you to use in your MC's background.

**Social context:**

Ask yourself: how are perceived human-alien relationships in your setting? Are they common? Are they frowned upon? Are they acceptable for some people (e.g., let's say humans with a given culture and background) and unacceptable for others? Those questions won't help you _start_ the relationship itself, but may help you understand what your characters will think in the initial stages.

Let's say, for example,. that interspecial relationship are not-so common and are frowned upon by the stricter part of the population. From your description, your male protagonist will probably avoid thinking of an human as a possible partner or love interest up until the very last moment. Maybe he will start having feelings for her, but will dismiss them as deranged and stupid, or be uncomfortable with the idea.

**Situational events:**

Again, most thing happen by sheer chance or luck. Moreover, someone said that relationships are based upon event, the concept of event meaning "two people interacting together in some way". Put it straightforwardly, they have to be together for some reason. Forced, if the needs arise. Leave them alone in a room and think of how this two may act, with only the other inside. It could be funny, since being from different races/culture they may have different habits and a different way to look at things.

An alien race of mine perceived gender-separated toilets as nonsensical, since every adult being "knows" what happen in there and is expected to mantain his/hers composure nonetheless. In the same story, my couple were to shipwreck on an unknown planet and cooperate to survive (again, you don't have to be so extreme).

In general, put them in situation where they can stick to their "normal" persona and see how things go from there.

Hope I've helped you somehow!

Original score: 2