Master x Servant
http://www.mangago.me/read-manga/theo/
http://www.mangago.me/read-manga/oh_my_young_master/
http://www.mangago.me/read-manga/to_take_an_enemys_heart/
http://www.mangago.me/read-manga/spinel_baekji/
http://www.mangago.me/read-manga/blood_bank/?tmcM
http://www.mangago.me/read-manga/itou_san_kuraka_sui/
http://www.mangago.me/read-manga/royal_servant/?tVFe
http://www.mangago.me/read-manga/puppy_love_eumnya/
http://www.mangago.me/read-manga/enthusiasm/
http://www.mangago.me/read-manga/geboku_sama_no_iu_toori/
http://www.mangago.me/read-manga/demon_of_lustful_hell/
http://www.mangago.me/read-manga/sahara_no_kuro_washi/
http://www.mangago.me/read-manga/zettai_fukujuu_meirei/
http://www.mangago.me/read-manga/my_partner_s_tastes_and_fetishes/
http://www.mangago.me/read-manga/make_me_bark/?orqU
As the title says.. BL with the Servant x Master trope. Preferable, the servant being the seme and the Master being the uke. Can be the other way round too