Responses
Here you go
http://www.mangago.me/read-manga/there_s_no_way_this_is_fate/
http://www.mangago.me/read-manga/there_s_no_way_this_is_fate_newlyweds_arc/
http://www.mangago.me/read-manga/ai_to_makoto_moriyo/ ---> twins
http://www.mangago.me/read-manga/choco_strawberry_vanilla/
http://www.mangago.me/read-manga/i_wanna_die_before_i_m_30/
Threesome yaoi recommendations where all three stay together until the end. Similar to Eunsoo's Good Day but preferably with a longer story.