http://www.mangago.me/read-manga/doutei_hitsuji_to_abazure_ookami/
http://www.mangago.me/read-manga/the_rain_in_montecarlo/
http://www.mangago.me/read-manga/koi_shika_dekinai_yo/
http://www.mangago.me/read-manga/joou_to_shitateya/
http://www.mangago.me/read-manga/yume_musubi_koi_musubi/
http://www.mangago.me/read-manga/trap_ootsuki_miu/
http://www.mangago.me/read-manga/takaramono_wa_hako_no_naka/
http://www.mangago.me/read-manga/tonari_ni_sunderu_neko_no_koto/
http://www.mangago.me/read-manga/kuroneko_wa_shippo_de_amaeru/
http://www.mangago.me/read-manga/sono_te_o_toreba/
http://www.mangago.me/read-manga/yamada_to_shounen/
http://www.mangago.me/read-manga/omerta_kochou_no_yume_no_kate/
http://www.mangago.me/read-manga/my_god/
I just finished reading this today & it was really good
http://www.mangago.me/read-manga/pornographer/
I hope these are what you are looking for ...
i'm looking age gap yaoi mangas