1girl, ahoge, barefoot, blue_one-piece_swimsuit, brown_eyes, casual_one-piece_swimsuit, chuutaro_metal, feet, genderswap, genderswap_(mtf), grey_hair, long_hair, lying, multicolored_hair, on_stomach, one-piece_swimsuit, onii-chan_wa_oshimai!, oyama_mahiro, simple_background, smile, soles, solo, swimsuit, the_pose, toes, white_background