2girls, :d, ahoge, black_hair, blonde_hair, brown_eyes, commentary, gradient_background, grey_background, hair_between_eyes, hair_ornament, hair_ribbon, hairclip, highres, hug, hug_from_behind, lab_coat, long_hair, long_sleeves, multiple_girls, onii-chan_wa_oshimai!, open_mouth, oyama_mahiro, oyama_mihari, red_ribbon, ribbon, same_(sendai623), siblings, simple_background, sisters, smile, twintails