1girl, animal ears, arknights, bird ears, bird girl, black panties, blush, bra, breasts, cokuto1, embarrassed, feather hair, fiammetta (arknights), hand up, lace-trimmed panties, lace trim, large breasts, looking to the side, navel, necktie, nipples, no bra, no pants, panties, red hair, red necktie, see-through, seiza, shirt, short hair, short necktie, short sleeves, simple background, sitting, sweat, underwear, white background, white shirt