The fantasy romance blueprint really lives and dies by a few central conflicts. Most revolve around the destined bond, often a mating bond or prophecy that forcibly entwines the leads. It's a built-in excuse for intense, fast-tracked intimacy, which I have a love-hate relationship with. It can feel lazy, but when done well, the tension comes from them fighting the bond or the societal weight of it.
Then you've got the power imbalance structure. One is usually royalty, a fae prince, a vampire elder, or a powerful mage, while the other is a 'special' human or a lower-ranking magical being. Their 'specialness' is key—a hidden power, a forgotten lineage, or a unique scent only the mate can detect. It's a wish-fulfillment engine, allowing for both vulnerability and eventual supremacy.
World-ending stakes are almost mandatory, but they often feel secondary to the relationship drama. The villain frequently wants the heroine for her power or bloodline, making the conflict intensely personal. The real glue, though, is the protective, possessive alpha male and the heroine's journey from resistance to embracing her own strength, often through him. After a while, you start reading more for the specific flavor of possessive dialogue than for any plot surprises.