"Fiery passion" refers to intense and strong feelings or enthusiasm towards something or someone. It implies a burning desire, excitement, or dedication that is vibrant and powerful. Full definition
Sometimes you will feel a low, steady burn, and other times that old fiery passion will flare up. (poweroftwomarriage.com)
Speaking of terrible romances, there's the gross relationship between cousins, not to mention the weird interactions between Michael and Kay (remember how they hated each other with fiery passion at the end of Part Two? (blog.bullz-eye.com)
Sometime in the very distant future, I also hope to pass her on to my niece, who might have inherited my same fiery passion for twirly dresses and sparkly shoes (if her current penchants are anything to go by). (thedressedaesthetic.com)