How to have two sims hate each other, but scorching woohoo life?

"Daephene;c-17435686" wrote:
Vampire with alluring aura might help, if one is a vampire. Not sure if the trait in the reward store will help, I also forget what it's called.

Beguiling?
Beguiling is a super-powerful Trait for Romantic endeavors. This trait gives your Sim an interaction found under Romance, "Beguile", which gives a Sim a +60 Flirty Moodlet for 4 hours. That makes them Very Flirty, and also very easy to woo, and maybe even Woohoo!