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aquatic asphyxiation bang_dream!bare_shoulders big_breasts black_body black_hair black_scales blush bodily_fluids bound breasts clothed clothing cloud crotch_lines death detailed_background double_kill duo dying erotic_asphyxiation exp_(artist)eyes_closed female female_death fin fish_tail front_view frown hair hands_behind_back hanged hi_res humanoid light_body light_skin long_hair merfolk navel neck_tied nipples open_mouth pink_body pink_hair pink_scales rope saliva scales sea shirokane_rinko sky slim slim_female slim_humanoid snuff split_form suspension tears topless uehara_himari water