1girl, ahoge, all_fours, bare_legs, barefoot, blue_shirt, closed_mouth, hitsukuya, light_brown_hair, long_hair, looking_at_viewer, male_underwear, no_pants, off_shoulder, onii-chan_wa_oshimai!, orange_eyes, oversized_clothes, oversized_shirt, oyama_mahiro, shirt, sidelocks, single_bare_shoulder, solo, underwear, wavy_mouth, white_background