Enemies with Benefits (A Calum Hood Fanfic)

Lily Smith had 2 best friends. Her fraternal sister Jade and Calum Hood. But what happens when her 2 best friends finally meet?
Calum and Jade start dating causing Lily's relationships with both her sister and Calum to go down the drain, causing them to all become enemies. Deep deep down Lily likes Calum which contributes to part of the reason why she hates him. One "accidental" hookup between Lily and Calum while he's dating Jade causes a cluster-fuck of events to take place making the tension grow between all. But what's the reasonings for Calum's actions between the sisters? Does he just not care about either when it comes down to it, or does he truly have feelings for one?
Also what happens once Jade finally finds out about her boyfriend and sister hooking up behind her back?
Read more to find out!