1girl, armpits, arms_up, black_hair, blue_buruma, breasts, buruma, closed_eyes, clothes_writing, collarbone, day, knees_up, lying, medium_breasts, navel, on_back, on_ground, one-piece_tan, open_mouth, original, outdoors, short_hair, solo, sports_bra, sweat, tan, tanlines, toin_(iitoin), toned, two-tone_sports_bra