Have you ever closed a book and wondered what the epilogue would look like for the main couple? Sometimes, that might be because there’s chemistry but not compatibility between the main characters.
Chemistry is one of the easiest things to recognize in a story.
Think about it as the opposite of that class you took in high school (shout out to my lab partners who basically carried me through that semester). This chemistry is actually fun. Because it’s the banter that makes you laugh. The stolen glances that make you read faster because you need to know what happens next. The tension that crackles every time two characters share a room. It’s the reason you find yourself whispering, Just kiss already.
Compatibility is trickier for both writers and readers. Because it’s the conversation they have after the kiss. It’s the aftercare after that spicy scene. I also build it into my spicy scenes—little hints that this is going to work longer than the sex.
Some of my favorite romances have incredible chemistry. The characters challenge each other, surprise each other, and make every scene they’re in more entertaining. But every once in a while, I’ll finish a book and realize I can’t picture what their lives look like five years later.
It’s not that I didn’t enjoy the romance. I just don’t know if I believe the relationship.
Here’s the Mechanics Monday lesson for both writers and readers.
Chemistry answers one question: Why are these two people drawn to each other?
Compatibility answers another: Why would they choose each other over and over again once the butterflies settle?
Hint: The best relationships need both.
Think about the couples you know in real life.
We’ve all met people who light up a room together. They make each other laugh. Their conversations bounce effortlessly from one topic to another. Everyone around them can see the spark.
Sometimes those couples build wonderful lives together. But sometimes they burn out just as quickly.
That’s because attraction alone isn’t what gets people through the chaotic mess of life.
Compatibility lives in the ordinary.
It’s how two people solve problems together. It’s whether they can disagree without trying to win. It’s whether they respect each other’s dreams, communicate through misunderstandings, and get through a string of day-to-day moments that make up a life together.
Ironically, those moments aren’t usually the scenes readers talk about after they finish a romance. They remember the first kiss. The confession. The grand gesture.
However, those scenes only resonate because, somewhere along the way, the story subtly convinced us these two people could survive everything that comes after.
As writers, it’s easy to spend all our time building chemistry. Banter is fun. Flirting is fun. The “almost” moments are some of the most satisfying scenes in romance.
Compatibility requires a little more patience. It shows up in mundane moments. My personal favorite? The moments where someone feels safe enough to become completely themselves.
Those scenes don’t always feel dramatic while we’re writing them. But they’re often the reason readers believe the happily ever after.
When I think about the romances that have stayed with me over the years, I don’t remember them because the characters had the best chemistry. I remember them because, by the final chapter, I couldn’t imagine either character building a life with anyone else.
That’s compatibility.
It’s also why I think the strongest romances don’t end with two people falling in love.
They end with readers believing they’ll still be together long after the story is over.