So, I'm having two similar but antithetical problems with some of my characters. With two of them, I need to make it clear that they're romantically attracted to one another. They're not dating, at least in part because they're both kidnapped slaves at the moment, (That rather puts a damper on their love live,) but they like each other. Problem is, I'm terrible at flirting in real life, and I don't know how to make it genuine and natural, and not seem forced or cheesy. My other problem, with two other characters, is that from the few friends I've shown it too, several think that they're going to end up as an item. One is a fourteen year old girl and the other is a thirty year old man, and I have absolutely no intentions of them ever, ever ending up together. I don't know how to make this abundantly clear to the audience, though, without just slapping them in the face with an 'It ain't gonna happen, guys!'