Yeah, I don't necessarily think a story that includes human trafficking must be setting out specifically to raise awareness about how to end human trafficking, but it is going to be something that needs to be handled really sensitively and thoughtfully and with a lot of knowledge of what that experience actually feels like and the effects it actually has. Later in the summary you describe Kristo, not as someone who's traumatised or hostile from the experiences he's had, but someone who's "open to everything" and wants to get this prudish religious guy to realise he's fallen for him.
Just googling "psychological effects of human trafficking," the first thing that pops up is a PDF for criminal justice folks talking about how thoughtful and careful you have to be, to get victims of trafficking to even talk to you about their situation without accidentally shutting them down, overwhelming them, or making them hostile to you, and how well-intentioned attempts to help them can immediately backfire if you don't know what you're doing. It seems like any story set in this situation is going to kind of need to revolve around the way it affects people involved, or it won't ring true.
Like, you can write a romance in this setting, but it seems like it'd be real complicated, and it'd mean that you'd need to be very invested in how this sort of trauma affects people.
Why set out to write a romance if you specifically find romance boring? A story doesn't ring true unless you believe in it. That doesn't mean you MUST HAVE EXPERIENCED TRUE ROMANCE or whatever, but you do really have to believe in the characters and care about what their love means for them. Sex trafficking aside, your description of a romance here doesn't give me any indication of why these characters would be in love -- only reasons why love would be difficult for them. The obstacles in the way of a romance can be the conflict, but they aren't the thing that makes us care about it.
What do these characters love about each other? "He's a prude, but he falls madly in love." Why? You have to care about that in order to write a convincing romance. One character who's open to anything and another character who's prudish and unwilling to express affection can absolutely fall in love, but like, we gotta see what they see in each other, specifically, and why they mean the world to each other. Heck, why does the "open to anything" character like or want to pursue this freakin prude?