um im not sure about you, but i like these
http://www.mangago.zone/read-manga/koi_ni_nare/
http://www.mangago.zone/read-manga/nemureru_hana/ - this one is a bit rough, but i found it nice in the end.
http://www.mangago.zone/read-manga/hidamari_ga_kikoeru/ - while this is actually shounen ai it is one of the most heart warming things ive ever read.
http://www.mangago.zone/read-manga/danshi_koukouseiteki_kazoku_keikaku/
http://www.mangago.zone/read-manga/kare_no_tokubetsu_na_kare/ - i dont know if you would call this heart warming but i thoroughly enjoy this one.
http://www.mangago.zone/read-manga/dekichatta_danshi/
i hope this is what you wanted
Yes..! I like those mangas too.. since i read lots of new mangas, i forgot the completed ones. Thanks for making me remember those mangas.
no problem im glad it helped
Feels so gloomy these past days. Guys, can you recommend me some yaoi manga with heart warming story..? I'm grateful with the newest update, but i want to feel the nostalgic feeling from sweet and good developed ones. ╥﹏╥