1boy, 1girl, air_conditioner, bad_twitter_id, blush, breasts, brother_and_sister, cleavage, comic, couch, crying, glasses, greyscale, hood, hoodie, indoors, medium_hair, monochrome, on_couch, original, short_ponytail, siblings, sweatdrop, tachibana_hiro_(yakitomato), tachibana_yuu_(yakitomato), tears, yakitomato