1girl, arm_behind_back, beach, bikini, black_bikini, blue_eyes, blush, breasts, cleavage, finger_to_mouth, girls_und_panzer, grey_hair, itsumi_erika, kneeling, kotorigaka, large_breasts, long_hair, looking_at_viewer, micro_bikini, navel, outdoors, side-tie_bikini_bottom, solo, stomach, swimsuit, twitter_username