I can suggest you that one :
http://www.mangago.me/read-manga/hanayome_wa_juunanasai/
This one has the married couple feeling to it although they aren't married... I would suggest it because it feels like it lol
I liked it a lot so I think you will like it too! (=・ω・=)
http://www.mangago.me/read-manga/kizuna/
Is there any story with bride male (yaoi). An uke/seme has been enganged or married? And then finally become a bride and happy ending. And the story tells about their life as a family together. Somekind "royal fiance" or one of the story in "black forest".
Im sorry if my explanation was so confusing