here are some suggestions from me. I wouldn't know what you have read already so just pick and choose the ones you haven't read ^_^
http://www.mangago.me/read-manga/end_love/
http://www.mangago.me/read-manga/empty_heart/
http://www.mangago.me/read-manga/cinematic_mirror/
http://www.mangago.me/read-manga/17_sai_no_hisoka_na_yokujou/
http://www.mangago.me/read-manga/datte_asobi_desho/
http://www.mangago.me/read-manga/mimitabu_no_riyuu/
http://www.mangago.me/read-manga/doushitemo_furetakunai/
http://www.mangago.me/read-manga/dog_style/
http://www.mangago.me/read-manga/soredemo_kamawanai/
http://www.mangago.me/read-manga/kiken_na_otonarisan/
http://www.mangago.me/read-manga/otonage_karikawa_seyu/
http://www.mangago.me/read-manga/ano_kado_wo_magatta_tokoro/
Tear Drop, Melancholic Mellow Mellow, Okurete Kita Renjou, Virgin Love, Shiranu wa Omae Bakari first couple, Room Share (Isino Aya), Escape (Kyuugou), Eien no Shichigatsu
Can someone reccommend me yaoi manga where sexfriends become lovers? I gave read most of the famous yaoi. Thanks.