happy ever after

Short definition from Wiktionary

Noun

1. 1
   Synonym of happily ever after (“a story, or a conclusion to a story, in which all the loose ends of the plot are tied up, and all the main characters are left in a state of contentment or happiness”).
2. 2
   Synonym of happily ever after (“a happy period of time which is imagined never to end; specifically, the state of happiness in which one or more people (typically a loving couple) dwell for the rest of his, her, their, etc., lives”).