Rule 34 Dev - 1girl black_hair black_panties blue_eyes blush breasts girls_und_panzer highres looking_at_viewer mask mask_pull monolith_(suibou_souko) mouth_mask navel ooarai_school_uniform open_mouth panties school_uniform short_hair simple_background small_breasts smile solo surgical_mask underwear utsugi_yuuki white_background|23281627941