Rule 34 Dev - 1girl ahoge back black_hair black_horns black_shorts black_tail blue_archive breasts coat cropped_legs demon_horns demon_tail from_behind halo heart highres horns kasumi_(blue_archive) lab_coat long_hair open_mouth red_halo riffle_hunter shorts simple_background small_breasts solo tail white_background white_coat yellow_eyes|21231352818