So here goes my two cents:
Hime wanted to avoid getting too (romantically) attached to Rurino, so she made an agreement with Rurino before they fucked for the first time (in chapter 1) that she's Rurino's "sex toys" and should be treated as such, but nonetheless she fell for Rurino. (I think the Sisyphus metaphor (chapter 0 page 7, though I can't blame those who mistake that as a jojo reference :P) in chapter 0 probably also implies that the guardrails Hime setup to make sure she won't fall for Rurino was/would be in ruin)
Rurino probably also likes Hime, but only to a normal friend (or sex friend) amount (chapter 3 page 29), not romantically. Knowing that 1) her feelings are likely unrequited 2) Rurino and Megumi entrusted her with the responsibility of being a responsible sex friends turned out to be her taking advantage of the chance to be intimate with Rurino 3) (debatable) she probably ship RuriMegu (chapter 1 page 21), too, so she rekt her own fav ship, she's crushed by guilt and angst she stopped providing sex service to Rurino for so long that Rurino engaged in sexual assult. (Hime also kind of expected and secretly wanted that.)
last edited at Feb 17, 2026 3:51AM