Here are some. :D
http://www.mangago.me/read-manga/honto_yajuu/
http://www.mangago.me/read-manga/kouun_no_rihatsushi/
http://www.mangago.me/read-manga/jounetsu_no_young_man/
http://www.mangago.me/read-manga/koakuma_no_sanctuary/
http://www.mangago.me/read-manga/koicha_no_osahou_tea_for_two/
http://www.mangago.me/read-manga/koisuru_boukun/
http://www.mangago.me/read-manga/konya_mo_nemurenai/
Oh sorry i didn't saw you want completed ones. So i've posted some ongoing ones. Sorry. >.<
Vassalord?? It's not comedy, per se, there are some funny moments and a good plot though. Bonus - it is complete
oh its okie i'm reading all of these btw XDDD it is hard to look for a great yaoi manga that is not famous konya mo nemurenai one of the best! XDDD
any recommendations? no tragedy or psychological please i prefer comedy romance complete if possible :D