Hotaru says “you’re submissive” (I think it’s Hotaru) and Setsuna kind of looks at her like “uh”.
I’m thinking the implication is that Hotaru has been spying on Haruka and Michiru’s BDSM.
adventuresofcomicbookgirl:

Don’t worry, this part is relatively short and I’m going to try hard to restrain myself for the other part. I figured I’d go ahead and do this in light of some…other stuff.
Plot: Fourteen year old Usagi Tsukino is a normal Japanese schoolgirl, though she’s clumsy, impulsive and a bit of a crybaby. Her life changes completely when she meets a talking cat called Luna, who tells her she must fight evil as Sailor Moon and find the princess who she must protect. Though reluctant at first, Usagi fights the newfound enemy, on the way gathering allies in other girls with blessed with the same destiny, encountering a mysterious masked man and learning the truth about herself, her past, her future and her identity and depths of courage she never knew she had.
There are several different mediums and continuities to Sailor Moon and each are worth checking out. I’ll have to introduce them all, and I’ll be outlining the different strengths and/or weakenesses in each one for each category.
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I figured adding pictures really breaks up my reviews and makes them more enjoyable, so I’m going to go back and add pictures to most of them. Sailor Moon was hit first, and I did some minor edits cutting out parts where I was too spoilery/unclear/specific.