http://www.mangago.zone/read-manga/mou_ichido_nando_demo/
http://www.mangago.zone/read-manga/shiranu_wa_omae_bakari/
http://www.mangago.zone/read-manga/itoshii_hito/
http://www.mangago.zone/read-manga/tear_drop/
http://www.mangago.zone/read-manga/bond_z/
http://www.mangago.zone/read-manga/oko_sama_box/
http://www.mangago.zone/read-manga/not_love/
http://www.mangago.zone/read-manga/tsuzuki_wa_mata_yoru_ni/
http://www.mangago.zone/read-manga/renai_rubi_no_tadashii_furikata/ from ch. 3
http://www.mangago.zone/read-manga/from_701_goushitsu/
http://www.mangago.zone/read-manga/nikutai_kankei_kaiya_tatsumi/
Any yaoi where the couple starts off as sex friends?