I re-read 'Interview with the Vampire' every few years and it’s still the benchmark for me. The romantic agony between Louis and Lestat is so layered—it’s possessive, destructive, and weirdly tender, wrapped up in all that existential dread. It’s not a healthy romance by any stretch, but it’s deeply compelling.
For something more overtly romantic, I’d suggest 'A Discovery of Witches'. The central relationship between a witch and a vampire develops slowly across the trilogy, with a lot of historical research woven in. Deborah Harkness builds a whole secret world around them. The romance feels earned, though some find the pacing a bit deliberate.
If you want pure, almost nostalgic paranormal romance, the 'Night Huntress' series by Jeaniene Frost is a blast. Cat and Bones banter and fight demons, and the relationship has a great enemies-to-lovers energy. It’s fast-paced and fun, less brooding, more action-packed.