After getting a taste of his own medicine from Lord Tirek, Discord has decided to take his reformation a bit more seriously. Sure, he has magic and friendship again, but it's clearly not enough to warrant his own throne in Twilight's fancy new castle. In order to earn the coveted throne, he figures that he has to be the best friend he can be.
While scrolling through the Friendship Journal for inspiration and pointers, an epiphany hits him. Since he was reformed, he has never made an honest attempt to make new friends by himself. As the first step on this new journey, he decides to rectify that. And who better to befriend than the other ponies that provided the keys to the chest? It's the perfect plan!
Too bad he doesn't really know what he's doing. Yeah, despite understanding empathy, Discord still has a lot to learn about friendship.