um i never read kuroneko so i don't know if these what suits ur taste or not but here are some of the yaoi/shounen ai that made me cry:
-Given http://www.mangago.zone/read-manga/given/
-Paradise View http://www.mangago.zone/read-manga/paradise_view/
-Kimi to Parade (prequel of Paradise view, but read Paradise view first) http://www.mangago.zone/read-manga/kimi_to_parade/
-Kowagaranai de soba ni ite http://www.mangago.zone/read-manga/kowagaranai_de_soba_ni_ite/
-Tamayura http://www.mangago.zone/read-manga/tamayura_yuki_ringo/
-Nigatsu no eden http://www.mangago.zone/read-manga/nigatsu_no_eden/
-Hidamari ga Kikoeru http://www.mangago.zone/read-manga/hidamari_ga_kikoeru/
-Life senjou no Bokura http://www.mangago.zone/read-manga/life_senjou_no_bokura/
Those listed are really heavy on the plot and only has a few to no sex scenes, or the sex are not explicitly drawn, but anyway..
Any yaoi manga willing enough to make me cry like Kuroneko series rtf?