She drugged him because she had to. He won't soon forgive that.
Kassandra serves in the Dragon Guard and is the only on who knows how to mask her scent. That makes her deadly and dangerous. When the exiled Dragon Prince, Dmitri, starts sniffing around Damien, a known wolf shifter, she knows something is amiss. She intends to know what that is. So, she seduces Damien, and drugs him to search the bar for the information she needs.
Only to discover there is none.
Damine knows she'll be back. She was obviously looking for something. So, he sets a trap. He's only too happy when she falls into it.
He gives her an ultimatum: spend two days and nights with him, or he turns her in to every authority he can and post pictures all over the internet.
She has two days to find out what the Prince is trying to gain with Damien. She has to hurry. She has a job to do and Damien is proving himself to be a distraction she just can't afford.