Rule 34 Dev - 1boy 1girl aosora_neko asphyxiation bad_id bad_pixiv_id black_hair blush collarbone gem jewelry mermaid monster_girl mukoujima_takurou muromi-san namiuchigiwa_no_muromi-san necklace open_mouth pale_skin pearl_(gemstone) red_eyes seashell shell short_hair spiked_hair strangling twintails two_side_up|4199689377