Dive into your creative stream
typical 007 scene where you are both from different agencies, but with the same mission. you have known him for years, always stealing each other's victories in the last second... with a teasing smirk curving your lips while the other just wishes to have been quicker. maybe you have history, too, a past fling in which you both caught feelings, but also broke each other's hearts.
even better, make it a fantasy story, enemies to lovers that bump into each other at a ball, both with the mission to end with their lives. you recognise him, and see the glimpse in his eyes that indicates he has too, he knows who you are. but you can't spill blood in the dance hall, so you let him slide his hands around your waist and lead you in a waltz, to the rhythm of violins and the melody of the piano.
until you're panting, your head spinning after dancing and sliding your heels on the marble floor... and then he guides you to an empty room, your back against the wall, his hand on your neck, squeezing it slightly, just enough to keep you breathing. and you sneak your hand to grab the dagger you keep tied to your thigh, pressing it to his throat. and you look into each other's eyes, chests rising and leaning in anticipation, your breaths mingling, leaning into each other until you're so close the only option is to brush your lips against his... and then the fight is between your mouths, in a fierce kiss, all tongue and teeth and fire and passion.