2boys, amagi_hiiro, amagi_rinne, animal_ear_headphones, animal_ears, aqua_eyes, aqua_nails, aqua_tongue, bare_shoulders, brothers, cat_ears, drawstring, ensemble_stars!, fake_animal_ears, fingerless_gloves, gloves, grey_background, headphones, hiirorinne, interlocked_fingers, looking_at_viewer, magnet_(vocaloid), male_focus, multiple_boys, open_mouth, portrait, round_teeth, short_hair, siblings, song_name, spot_color, teeth, turtleneck