Rule 34 Dev - 00s 2009 2boys animal_costume barefoot bell black_hair boy_cow cow cow_costume feet flower glasses green_eyes hair_between_eyes highres horns itoshiki_majiru itoshiki_nozomu japanese_clothes kimono leaf male_focus mashiro_yuuki multiple_boys new_year sayonara_zetsubou_sensei short_hair siblings smile white_background|1221371775