The Secret Names of Stars (Star Trek XI, Mirrorverse, NC-17 with warnings)

Behold my new tentacle icon! Which is almost completely inappropriate for this particular story, but c'est la vie.

Title: The Secret Names of Stars
Fandom: Star Trek XI
Rating: NC-17 with warnings.
Pairing: Chekov/Cthulhu, Chekov/Sulu, Cthulhu/Sulu kinda implied.
Summary: "What will you give me?" Chekov asks. Written for this prompt.
Content Advisory: Mirrorverse. Tentacles. Shockingly enough, actually consensual (for the most part). Slash.
Acknowledgements: fairhearing for asking and shinychimera for this picture prompt
Disclaimer: None of these characters belong to me.

( The narrow inhuman eyes above the slowly writhing tentacles where the Unpronounceable's mouth should be. )