sugimura tomokazu, xp-tan, os-tan, 1girl, :o, bare shoulders, black hair, blue eyes, blush, breasts, calendar, covered erect nipples, crossed arms, december, detached sleeves, female focus, gradient background, hair between eyes, hair ornament, jewelry, large breasts, long hair, open mouth, ribbon, ring, see-through clothes, shirt, sidelocks, sleeveless, sleeveless shirt, solo, taut clothes, taut shirt, upper body, very long hair, zipper