Responses
This was was dropped, but it's available on renta is that's viable for you:
http://www.mangago.me/read-manga/nuretoro3p/
And there's this one too
http://www.mangago.me/read-manga/ai_to_makoto_moriyo/
Are there any 3p mangas/manhwas? I've read the ones I've ever found (2), and one of them turned out to be monogamous. (╯°Д °)╯╧╧