A silly, but perhaps not inaccurate, theory about Lapis and Garnet.
I was wondering how Lapis knew what Ruby and Sapphire flirting looks like and I came up with this scenario:
Garnet: *alone at home*
Garnet: *glances at Lapis mirror on the table*
Garnet: *picks it up. stares at it blankly, and then smiles*
Garnet: Why look at you, handsome?
Garnet: Who, me? Surely you must be talking about somebody else.
Garnet: Who else but the most gorgeous fusion on the planet?
Garnet: *blushes* I am the lucky one, I’m talking to the most gorgeous fusion in the universe…
Garnet: *blushes more and chuckles*
Garnet: *proceeds to flirt with herself for hours*
Lapis: *screams internally, screams eternally*