Almost everyone likes some romance mixed with the main genre, probably because of roleplaying. But sometimes i grow up attached to some characters and can’t accept any other path where MC and character aren’t together. Am i the only one?
Anyways, sometimes romance is complementing the main genre, even if they’re somehow opposed/unrelated. Take as example To the Moon, there the romance between the most important character (don’t remember his name, and he’s not MC) and some girl (forgot her name too), really made me cry, because i developed a bond with the two and seeing how tragic it ended, with the girl dying from a disease years after marrying with him, and then how the machine shows his dream of staying together with her, coupled with the fact that it was all during his final moments.
I couldn’t stop crying, and it was all inside of a tragedy/adventure/whatever the hell that game was, where the romance was an important part of the main plot.
And i could go on telling how romance can create happy/sad backgrounds and complement the focus of the story. But it depends on what feelings you’re trying to transfer to the audience, if it’s a serious relationship or a casual one, and other details. Of course, every romance needs a background for both characters, otherwise it’s just annoying.
Also, you don’t need to focus your game in romance only because there’s an option to it, as someone else said, it should stay as a subplot. Especially if we’re talking about a CYOA.