unhinged/dark dianetti...
gina cleaning rosa's cuts after a bar fight while telling her how hot it was to watch rosa absolutely fuck up some guy twice her size
gina walking in on rosa sharpening one of her knives and saying casually, "prepping for tonight i see" with no further elaboration
a fight getting real heated with both of them screaming in each others faces. finally rosa grabs gina by the throat and shoves her against the wall which turns gina on (obviously) and it ends with sex. (it always does)
a stalker from gina's social media has been tailing her for weeks sending threats from a anonymous account. the 99 are on it and rosa was told to stand down from the case because she was too close to it. ignores the order, when she catches the guy attempting to break into gina's apartment one night she kills him on the spot. never told anyone obviously and no one ever found the body
they spend a night at rosa's apartment playing a drinking game, just the two of them, with a number of rosa's weapons alarmingly close at hand. this is how rosa finds out that gina can throw knives like a pro and destroying her door was so worth it
rosa is canonically scared of needles and would never get a tattoo. gina however has a tramp stamp of two dark angel wings that rosa discovers one night during some,, activities. rosa worships that tattoo.
when gina stays overnight and uses rosa's shampoo, sometimes rosa comes up from behind her at the precinct the next day and takes a handful of gina's hair, pulling it back so she can smell her own scent. then she whispers in gina's ear "hope you're planning to pay me back for that."
gina sometimes films rosa while she's sleeping. she has a folder in her phone just for those videos and never tells rosa about it
one time at shaw's when rosa was drunk, she asked gina who she would rather sleep with, her or rihanna. when gina answered 'rihanna' without hesitation, rosa punched the bar so hard she broke two fingers and hank the bartender kicked her out
everyone in the precinct is absolutely terrified of them because rosa and gina are constantly talking shit about each other but then if someone else even makes a slightly critical comment about either one, the other will be out for that person's blood
their relationship is not exclusive but gina gets jealous about the most random things. once when rosa introduced her to a man she was seeing gina wouldn't speak to her for a month after she found out that rosa had let the boyfriend use her library card (only gina has the right to use rosa's library card.)
when they're genuinely fighting it gets Bad because they know each other so well, down to the deepest secret, so when they go at each other they know how hit it where it hurts.