Romance as a Subplot

Romance subplots abound in fantasy - but while most fantasy authors are pretty well-versed in worldbuilding and combat writing, fewer of us have made a serious study of romance writing. What goes into crafting a believable romance? Is there a difference between romantic tension and sexual tension? What is chemistry, and how is it evoked on page? Five authors of character-driven romantic fantasy share their best tips, gleaned over years of work, for crafting a romantic subplot to captivate the most hard-hearted reader.