There was no reason to trade Lucnes for Nessian other than the fact that SJM wanted to punish Nesta. Why would Nesta even be in Night if she was mated to Lucien and serve Feyre for the rest of her life?
Lucien will rip her apart.
The Lucien who realised exactly what his mate needed with one glance?
The Lucien who was the only one to suggest bringing a healer to check on his depressed mate?
The Lucien who was the only one to listen to his mate and treat her like a person?
The Lucien who went on a quest just because his mate had a dream?
The Lucien who gave his mate space and time when she wasn't ready to accept her fae life or the mating bond?
The Lucien who marvelled at Nesta's powers instead of seeing her as a weapon?
Cassian is the one Nesta needed.
The neanderthal who saw his emaciated mate and the first thing he noticed were her boobs?
The neanderthal who said 'eat this or starve' when his depressed mate didn't like his food?
The neanderthal who laughed at his mate after she climbed up the stairs with bruises on her face?
The neanderthal who had sex with his mate right after she was sexually assaulted by an ancient creature?
The neanderthal who rejoiced at how happy his brother will be at his mate's misery?
The neanderthal who forced his mate on a dangerous hike when she was suicidal?
I hear delusions. But thanks for playing.