Love mode!
A good ass romantic yaoi? Umm ... sure, I think, although I don't know if you are referring to good ass literally, as in any artwork of magnificent male butts by Ranmaru Zaria ( http://www.mangago.me/read-manga/nemuri_otoko_to_koi_otoko/), or just a goodhearted romantic yaoi that makes you sigh and think, "Yeah, that was really good-assed!"
http://www.mangago.me/home/mangalist/902/
check out this list http://www.mangago.me/home/mangalist/186353/
it has romantic mangas but they might not be long
check out this list http://www.mangago.me/home/mangalist/186353/
it has romantic mangas but they might not be long
Anyone have a good ass romantic manga thats long