Well, while we wait for the next piece, I do have another suggestion involving Luna and Meyrin.

It's a 'kinky time gone all the way' thing.

In this story, the two would be in a bit of an incestuous relationship, and Luna's developed a bit of a breathplay kink.

Not sure what the EXACT circumstances would be, but Luna decides she wants to go all the way, and has Meyrin choke her to death while they have sex. Meyrin would then kill herself to join her sister, either through hanging or disemboweling herself. If she hangs, I'd let you decide whether Meyrin gets off or not, though if she disembowels herself, she can masturbate with her entrails.

Think that idea could work?