Girls of Paper and Fire by Natasha NGan

Kidnapped to serve as a consort for the
cruel Demon King, Lei finds forbidden
love with a fellow "Paper Girl." Their
secret romance transforms her struggle
for survival into a dangerous rebellion
against the monarchy.

This book contains: alcohol, alternate
gender/sexual ideologies, death/grief,
deception, demonic content (themes),
derogatory terms, dubious constent, explicit
sexual activities/nudity, gore, murder,
misogyny, profanity (minor), PTSD (themes),
dialogue, sexual grooming of minors, sexual
innuendos, sexual slavery involving minors,
suicidal thoughts, torture, toxic relationships,
violence (excessive/graphic) and voyeurism
(implied).