I love Daggers-as-Siblings AU's (with IceMav as the Parents)...especially when it comes to Hangman and Phoenix.
Like Hangman will tease and taunt Phoenix, as any big brother would do to their younger sister - but he will not mess with her beyond that.
Because this is the girl who shaved his eyebrows while he was sleeping.
This is the girl he's lost every single bet to.
This is the girl who would steal his phone and change Rooster's ringtone to something by Barry White (he could never figure out how to change it back so Ice or Mav had to force her to change it back for him).
...But this is also the kid sister who punched a boy in the face for calling her brother a f*ggot.