Les Yay: Rose and Lissa, especially in the final chapter of Shadow Kissed and a lot of Blood Promise. The part where Rose leaves the academy and heads to Russia is pretty much like a break-up scene, you don't even need to change the dialogue:
“Why didn’t you tell me?” She cried.
“I couldn’t tell anyone,” I said.
“You should have told me,” She repeated, “I feel like you don’t trust me.”
“Of course I trust you.”
“Is that why you’re sneaking off?”
“That has nothing to do with trust,” I admitted, “It’s me...well, I didn’t want to tell you. I couldn’t bear to tell you I was leaving or explain why.”
- And then there's this little gem not too long after that:
I shook my head, “I have to do this.”
“Even if it means leaving me?”
The way she said it, the way she looked at me...oh God. A flood of memories flitted through my mind. We’ve been together since childhood. Inseparable. Bound.
“I have to do this.” I said yet again, “I’m sorry.”
“You’re supposed to be my guardian and go with me to college,” She argued, “You’re shadow-kissed. We’re supposed to be together. If you leave me...”
- Given that Rose is only going to Russia so she can Mercy Kill her ex-boyfriend (who has been turned against his will into an evil, soulless vampire) that whole conversation really comes off as Lissa being jealous of how important said boyfriend is to Rose. And then, when Rose does leave, Lissa falls into this dark, depressed state where she completely changes her personality (admittedly, most of that was because she was being brainwashed into doing so, but still) and starts drinking again, becoming a vapid party girl. It doesn't help that Lissa's own boyfriend tries and fails to bring her out of this state, but when Rose calls...
- Rose openly states several times in narration that Lissa and Dimitri (the aforementioned boyfriend) are the most important people in her life, and she hopes constantly that she'll never be forced to make a Sadistic Choice between them- because she doesn't know how she'd choose.
- It is not an exaggeration to say that the author spends more time developing Rose and Lissa's friendship and showing scenes of them together than she does for Rose and Dimitri.
- Also, the intricacy of Lissa's powers basically demands that a shadow-kissed companion (in this case, Rose) stay with her for the rest of their lives, comforting her when she falls into depression through usage of said powers, and just basically be a trusted, devoted friend that has the strength to sway her from the Dark Side. So there's that, and all the political hate circling around Lissa, what with the vampire court disapproving of her 'progressive' views on how their society should be, and there are so many monologues on Rose's part about the nature of loyalty and love and how they make life worth living...
- Also, you know the whole 'biting-gives-you-intense-pleasure' thing that most vampire fiction has? Yeah, this series uses it too, although with a fair side of deconstruction. And yes, there are scenes where Lissa bites Rose, and Rose's narration...doesn't really gloss over things like that.
- Interestingly, the bullies at the high school they go to do briefly shout insults about them being 'fags,' but Lissa and Rose just ignore them, and it's treated as a fairly common slur, with not much truth behind it. Later, the bullies switch to spreading more malicious rumors.