1girl arm_at_side arm_up bangs bare_arms bare_shoulders bat_wings bikini black_bikini black_wings breasts cleavage collarbone commentary_request cowboy_shot demon_horns demon_wings expressionless from_side hand_in_own_hair highres hiiragi_yuuichi horns long_hair looking_at_viewer medium_breasts navel o-ring o-ring_bikini parted_lips pointy_ears purple_eyes purple_hair sidelocks simple_background sketch solo standing stomach string_bikini swimsuit upper_body white_background wings