If you are really wanting to marry faster. I would recommend buying another Tama-Go, Hope one is a Boy and one a Girl.Connect them as much as you can... Then the marry option will show when they are both 6years old. Then they will have a baby instantly and it will olny take 2 days before the parents leave...
Otherwise, there isn't any real cheat. You need to wait another 24 hours before you can have a chance to marry again.