Man, it’s a huge genre, so my picks tend to lean into series where the world feels alive and the magic directly fuels the passion. T. Kingfisher’s 'Paladin' series, starting with 'Paladin’s Grace', nails this for me—the world is full of weird gods and decaying magic, and the romantic tension between the paladins and the clever women they meet is just chef's kiss. It’s not the spiciest out there, but the emotional build is so thick you could cut it.
For pure, unapologetic fantasy spice, you can’t go wrong with Kathryn Ann Kingsley. Her 'Harrow Faire' series blends dark circus magic with a morally grey villain love interest, and the push-pull is addictive. The magic system is part of the seduction, literally—it’s about puppets and illusions and possession. I found the first book a bit slow, but by the second, I was completely sold on the creepy, obsessive dynamic.