These are all yaoi/shounen ai and have Halloween/scary themes (ex. vampires, wolves, demons etc.)
http://www.mangago.me/read-manga/shinpu_sama_no_kyuuketsuki/
http://www.mangago.me/read-manga/vampire_library/
http://www.mangago.me/read-manga/radical_blood_monster/
http://www.mangago.me/read-manga/konya_mo_nemurenai/
http://www.mangago.me/read-manga/kohitsuji_project/
http://www.mangago.me/read-manga/crimson_spell/
Hope these are good! Enjoy (⌒▽⌒)
shoujo or yaoi please
devils,demons,ghosts oh my
fluffy or smutty is ok