Evan ‘Buck’ Buckley is in a toxic, abusive relationship with Tommy. Buck keeps showing up at the 118 with new bruises and cuts, and while the whole firehouse knows what’s going on and constantly tells him he needs to leave, no one tells Y/N. Y/N is Buck’s best friend and doesn’t knows the truth casue they know y/n will kill Tommys. Until one day bucks nose is broken and Mac walks in on hen patching Buck up