These are really good, I hope you like them as well!!
http://www.mangago.me/read-manga/let_dai/
http://www.mangago.me/read-manga/fushidara_na_hanatsumi_otoko/
http://www.mangago.me/read-manga/doushiyoumo_nai_keredo/
http://www.mangago.me/read-manga/raising_a_bat/ [Shounen ai, but still amazing]
http://www.mangago.me/read-manga/kashikomarimashita_destiny/
http://www.mangago.me/read-manga/himegoto_asobi/
http://www.mangago.me/read-manga/itou_san_kuraka_sui/
http://www.mangago.me/read-manga/totally_captivated/
http://www.mangago.me/read-manga/kayashimashi_no_yuuga_na_seikatsu/
http://www.mangago.me/read-manga/kimi_ga_koi_ni_midareru/
http://www.mangago.me/read-manga/koi_to_wa_yobenai/
http://www.mangago.me/read-manga/kare_no_shousou_to_koi_ni_tsuite/
http://www.mangago.me/read-manga/work_fight_and_love/?av=2
http://www.mangago.me/read-manga/sweet_blood_kim_se_young/
http://www.mangago.me/read-manga/ousama_ni_kiss/
http://www.mangago.me/home/mangalist/271309/
(๑•ㅂ•)و✧
Can someone give me some good yaoi recommendations but with long chapters and completed (black and white are fine.