How about this one? x)
http://www.mangago.me/read-manga/kusatta_kyoushi_no_houteishiki/
http://www.mangago.me/read-manga/lucky_number_13/
http://www.mangago.me/read-manga/hyakujitsu_no_bara/
http://www.mangago.me/read-manga/kizuna/
http://www.mangago.me/read-manga/ http://www.mangago.me/read-manga/sadistic_boy/
http://www.mangago.me/read-manga/deki_no_ii_kiss_warui_kiss/
http://www.mangago.me/read-manga/hydra/
http://www.mangago.me/read-manga/hai_to_diamond/
http://www.mangago.me/read-manga/kishidou_club_bangaihen/
http://www.mangago.me/read-manga/shiiku_gakari_rika/
the rules series by miyamoto kano
hydra - lovers and souls - rules - rules 2nd season
http://www.mangago.me/read-manga/hydra/ (and then follow the order i gave you)
New York New York
http://www.mangago.me/read-manga/new_york_new_york/
Hai to Diamond
http://www.mangago.me/read-manga/hai_to_diamond/
punch up
http://www.mangago.me/read-manga/punch_up/
Brother X Brother
http://www.mangago.me/read-manga/brother_x_brother/
Dunno if you have read them or not, but those are ones I recommend ^^!
You can look through my list. http://www.mangago.me/home/mangalist/19097/
http://www.mangago.me/read-manga/castle_mango/
http://www.mangago.me/read-manga/dear_green/
http://www.mangago.me/read-manga/dear_green_hitomi_no_ounowa/ sequel
http://www.mangago.me/read-manga/jazz/
http://www.mangago.me/read-manga/oteuchi_kakugo/
http://www.mangago.me/read-manga/kakeochi_kakugo/ sequel
http://www.mangago.me/read-manga/the_hinanomori/
http://www.mangago.me/read-manga/momoiro_junjou_danshi/
http://www.mangago.me/read-manga/momoiro_renai_jijou/ sequel
http://www.mangago.me/read-manga/yatteraneeze/
and the series from Fujisaki Kou:
http://www.mangago.me/home/mangalist/7543/
Guys please give me a yaoi manga with more than 1 volume that not everyone has read?