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anthro bdsm bioluminescence biped bondage bound breasts chain cyan_hooves equid equine facial_markings female genitals glowing glowing_hooves glowing_horn glowing_markings grey_hooves head_markings hooves horn legs_up looking_at_viewer lying magic mammal markings mythological_creature mythological_equine mythology niko_(kcravenyote)nipples nude on_back pinup pose restricted_palette shinigamigirl solo submissive submissive_female tail tail_tuft tongue tongue_out tuft unicorn vulva