Heartwarming / New Super Mario Bros. U

  • The ending of the game. When you finally find Peach. Whoever landed the last hit on Bowser will get a kiss. Aww....
  • Helping Monty Mole in the extra games. Especially sharing a dance with him at the end. The game even refers to you as a babysitter.
http://tvtropes.org/pmwiki/pmwiki.php/Heartwarming/NewSuperMarioBrosU