"I’ll forgive anything if it’s a pretty girl!"
Okay, Usagi meta time: this is of course, another example of Usagi’s greatest strength being her acceptance of everyone and how she admires and is inspired by the women she comes into contact with.
Girls are taught by society to feel jealous and competitive towards girls percieved as prettier. But Usagi sees a hot girl and has hearts in her eyes and be closer to her. This isn’t just a virtue that comes from being queer. I know from experience that even girls who like girls will feel inadequate and intimidated when we see a ridiculously hot girl- “she’s hot, I’m not. I could never approach her. I could never be like her” And then the resentment society pounded into us comes in.
But there isn’t that for Usagi. She sees Rei and there’s no resentment or automatic comparing of herself to Rei- it’s just “a pretty girl! That’s so awesome! I’m crushin’ hard and I wanna get to know her!” She doesn’t allow any of the prejudices or obstacles society puts in place to get in her way. She loves pretty girls. She doesn’t feel the need to match them, she just wants to enjoy looking at them and being with them. She sees a hot girl and admires her and wants to be with her. That’s Usagi’s strength- she doesn’t let petty things slow her down when loving ladies- whether it’s a physical attraction or emotional.
Rei is probably used to girls resenting her for her looks or being intimidated by them. But she’s not going to get that here. She’s going to get a girl who is incredibly open in her admiration and will embrace Rei for all she is.
And that includes her powers. Usagi was attacked and now Rei’s talking about demonic presence and she doesn’t give a shit. Who cares if she had weird powers? That just makes her awesome! She’s a shrine maiden! That’s awesome! Usagi just accepts and admires Rei for her skill and occupation. Rei’s been ostracized for being powerful and strange, but here she’s found someone who will embrace, admire and celebrate what is different about her.