machi (machi0910), firefly (honkai: star rail), honkai: star rail, honkai (series), paid reward available, 1girl, alternate costume, arm up, armpit focus, armpits, bikini, bikini skirt, black bow, black hairband, blue eyes, blue hair, blue nails, blue sky, bow, breasts, cowboy shot, day, fingernails, frilled bikini, frills, from behind, gradient hair, grey hair, hair between eyes, hair bow, hairband, large breasts, long hair, looking at viewer, looking back, multicolored eyes, multicolored hair, nail polish, ocean, outdoors, parted lips, presenting armpit, purple eyes, sidelocks, sky, solo, swimsuit, thighs, twitter username, two-tone eyes, underboob, white bikini