1boy, 1girl, aria_(koiiroharemoyou), arihara_satoru, bare_arms, bare_shoulders, barefoot, belt, black_belt, black_hair, blush, breasts, christmas, cleavage, closed_mouth, covered_nipples, dress, embarrassed, eyelashes, frown, fur-trimmed_dress, fur_trim, hair_between_eyes, hat, headpat, hetero, indoors, ise_kotori, jacket, lap_pillow, large_breasts, light_purple_hair, long_hair, looking_at_another, looking_down, lying, necktie, on_back, purple_eyes, red_necktie, riddle_joker, santa_dress, santa_hat, seiza, shirt, short_dress, short_hair, sidelocks, sitting, smile, straight_hair, white_shirt, wing_hair_ornament, yellow_jacket