I feel like this is you baiting me into dishing out sex HC's for Quanxi and every sister... and it's working!

Oh, Makima. You love your dog-husband-weapon in the same way someone enjoys throwing a ball for their mutt to bring back. Fun, if temporary. No true respect but since when has Quanxi ever had respect for herself, anyway? At least she's pretty to look at and doesn't say anything when you get so angry you're the perpetrator in her losing a valuable eye. But, it's okay. Quanxi can make up for her transgressions in the bedroom with missionary monotony and intense eye contact. Emphasis on the eye's singularity. No, you won't ever consider lowering yourself into giving head but it's practically the same thing when your dog is leashed and smothered between your thighs. She's the best you've had and /will/ have but you'll surely forget such when she's eventually discarded for your eventual focus.

Lemme break out of my second-perspective shtick to offer the dynamic of yaoified-yuri when it involves her and Yoru. Strangely... equal, all things considered. Even though, much like Makima, Yoru does make it quite clear Quanxi is her weapon and all that entails. But at the least, Yoru is a gentleman in shucking Quanxi's slacks and taking what her younger sister wouldn't. It's funny watching humans lose their composure, even if Quanxi is about as stoic as the statues humanity has crafted in Yoru's likeness millennia prior. Raising morale, really. A false resemblance to intimacy grunting and huffing above with the torn bodies of those around as set-dressing. Yoru isn't much of a fan of the fairer sex's form to wear but supposes Quanxi shows her the benefits the first time she bottoms without the involvement of anal. Huh. No wonder women don't require prostates.

Kiga... I think she sees something similar to herself in Quanxi. A void. Unfulfilled. Once whole and left in broken pieces. Her sisters didn't take good care of her, clearly. Kiga isn't sweet but she hides nothing from Quanxi spreading her thighs and asking the woman to devour her. She'll do the same back. Maybe one of them will achieve nirvana and take the other with them. Kidding. Kiga knows how the world works. Quanxi does, too. But there's something maddening in staring at your reflection and saliva pooling on your tongue and your teeth itching to break off into succulent flesh. Quanxi can regenerate when Kiga's resolve breaks and she tears into her like a wild animal, woman's delight, raw and unfiltered but at least Quanxi knew what she was getting into as her bones are being licked clean.