What's Celestia to do with a horny little sister who wants to play when Celestia is not in the mood? Well, it turns out that Celestia has a handy set of kitty gear, and some time as a pet is just what Luna needs. (Not a clopfic.)
Shortly after his wedding to Princess Cadence, Shining Armor opts to take some time to talk with Twilight. Both because he wants to know more about her life in Ponyville, and because he wants to apologize for being absent from her life for so long.
Following the Changeling Invasion of Canterlot, Twilight's friends, Princess Celestia and Shining Armor lament over how they failed to protect Canterlot from the Changelings as well for their behavior towards Twilight at the Wedding Rehearsal.