Dearly Beloathed: Irresistible Urge to Fall For Your Enemy

Osric Mordaunt, member of the Fyren Order of assassins, is in dire need of healing. Naturally - such is the grim comedy of fate - the only healer who can help is Aurienne Fairhrim, preeminent scientist, bastion of moral good, and member of an enemy Order.

Aurienne is desperate for funding to heal the sick - so desperate that, when Osric bribes her to help him, she accepts, even if she detests him and everything he stands for.

A forced collaboration ensues: the brilliant Woman in STEM is coerced into working with the PhD in Murders, much to Aurienne's disgust. As Osric and Aurienne work together to heal his illness and investigate the mysterious reoccurrence of a deadly pox, they find themselves ardently denying their attraction, which only fuels the heat between them.

Tropes include:
Enemies-to-lovers
High interaction slow burn
Hypercompetent idiots
He falls first and harder
Slaughter as a love language