

You could set your story in a historical setting in which the countess and the gardener are truly forbidden from passion, or a fantasy world where the ogopogos and sasquatches are sexy rivals.
The amount of pirates on the covers of romance novels is the direct result of this.
Or just have a lukewarm type of forbidden-ness, like “his family’s greeting-card store is in competition with my family’s greeting-card store” or “we’re coworkers.”
And the hallmark channel answer. I had a coworker who would watch those every single day. I vomit at the visuals (how do they get them so consistent and apparent? You can tell just from the opening shots and title!) of a hallmark to this day.
And they’re smart enough to take people when they aren’t able to do “2A people” type stuff. It’s hard for an illegal to own a gun in the first place, much less have it at work when your boss will use any excuse to crack the whip at you to keep the others oppressed and in line.