Idk if this series will still update on mangago tho... but here
http://www.mangago.zone/read-manga/window_beyond_window/
check the description for each. there's plenty of them collected here http://www.mangago.zone/home/mangalist/50912/?filter=&page=1
Kuroneko Kareshi no Asobikata
Kuroneko Kareshi no Amaekata
Kuroneko Kareshi no Nakasekata
Kuroneko Kareshi no Aishikata
Kuroneko Kareshi no Afurekata
Kuroneko to Kareshi to Ouji
Fukigen kareshi no Saraikata
Yatamomo
Yaoi with continuous sex? Like they just keep on doing it one after the other. And The couple love each other of course :)) Sorry for being a perv!! And Thank you!!! :D