-Holiday will call Casey a bunch of random little terms of endearment in French, like Bébé fille or Cœur Tendre
-Holiday steals Casey's hoodies
-Casey has a shirt that says "I *heart* My Awesome Pansexual Girlfriend"
-They're both giant Sanrio fans, and they have Kuromi(Casey) and My Melody(Holiday) onesie's
-Weekly 80's-90's-00's rom-com movies nights w/ Magrus and Birdger
-Holiday has Casey in her phone as 'Beautiful Lesbian Dumb Ass"
-They were once asked if they were sisters

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Six Minutes randomness that's in my brain 24/7/365
Fanfictiontitle sums it up pretty good.