Why Haruka flirted
Okay, I know in the anime, Haruka flirts with every girl, but this isn’t so in the manga and I think the reason is significant. In the manga, Haruka only flirts with Usagi and I don’t believe this is because she wanted to hook up with her.
The Outer senshi protected the princess and the Moon Kingdom from afar. Even to Luna they were like legend. They were never allowed to get closer to earth, even when the end came.
The senshi have dedicated their lives, every incarnation, to their princess; they all love her. But the outer senshi are the ones who could only look on from afar. Now they have awakened together, the enemy is already active and the awakening of Saturn is imminent.
They know they may die in the battle to protect her, they know she may hate them if they manage to kill Hotaru and even if they live, they are still working under the assumption that their place is separate.
But they are finally close to their princess. And maybe, before everything goes to hell and the princess knows who they are and they have to push her away, they decide to just get a little closer to her. Haruka flirts and even gives Usagi a kiss, because this shining princess, as clumsy and awkward as she is now, is also the center of her existence. Even Michiru gives Mamoru two tickets to her concert, knowing Usagi would be who he brings, maybe so that just once she can play the violin for her princess.
So that’s my theory why, in the manga, Haruka flirted with Usagi and only Usagi (and why Michiru wasn’t kicking her ass for it).
*Edit: Also this makes post number 500!!!
Wow, truth spoken! *glares at Usagi and Haruka shippers* jk jk