"You're too hard on her"
Cassian grows, dark eyes boring down into where Nesta has you bawling in her lap from punishment, skin reddened. Cassian likes to take a softer touch to you, you're gentle and fragile. they frequently clash over you.
It had been a mutual decision to seek external comfort for the both of them, with the fights and distrust, they were mates, they loved each other, but the clashing was becoming too much, too often. A third would allow them to blow off some steam and rationalize before they killed each other. They had never meant for feelings to get involved but it's too late now, things are messy
Feyre had offered to introduce you to them when Nesta reluctantly confided in her. You were a friend of Feyre's, a waitress in Rita's aiming to be a writer, you were soft and sweet and the perfect middle ground. You also had a terrible relationship with your parents which was a bonus because you were willing to agree to most things, Feyre and Rhys would know. You've been with them a few times too, no feelings there though. Is it wrong to exploit you like that? Yes. Do they care? no.
It hadn't taken long for you to become accustomed to life between the three of you, not much has changed except the insanely long list of rules on the fridge. The house of wind is lush and beautiful and you enjoy it there, the perks that come with being their third are wonderful but the position comes with rules too. too many to count. the rules remind everyone of the arrangement and keep things clear but Cassian wonders if it's too late for that anyway.
Nesta glares up at him, petting your hair
"You coddle her too much, she broke a rule so she got punished, she's a big girl, she knows the rules. bad girls get punishments don't they?"
She taunts lightly, scowling when Cassian coos at your tearstained face