Discord is in love with Princess Celestia. He tries to express this in a letter to her.

Somehow, they end up watching a movie together.

...Wait, what?

This story is a sequel to The Moon Glows Gently

When you're the immortal ruler of an entire kingdom, the most important quality to possess is self-control. No princess can rule her nation if her emotions rule her. Celestia knows this better than anypony, and mastered them long ago.

So long ago, she may have forgotten that a little bit of passion can come in handy now and again.

Tonight, on a very special episode of My Little Pony…

Spike may have finally found someone who can reveal the identity of his parents. But when that someone is Discord, has our little dragon bitten off more than he can chew?

~-Spike jumped up from the couch in excitement. "Then you've actually met them!?"

Somehow, Discord's grin managed to stretch even wider. "Ohhhhhh yes. In fact, I've known your father since the day we were born! And your mother… well let's just say she and I are intimately acquainted…"-~

Sequel to An Unlikely Couple. Upon hearing that his beloved wife Celestia is pregnant, Discord proceeds to have a midlife crisis. Afraid that the best of his years are behind him, it will take Twilight and Celestia to make the spirit of Disharmony see that fatherhood really isn't that bad. Not only that, his growing rivalry with Luna will only serve to make matters worse...

Discord waits alone and forgotten in the Canterlot gardens, brooding over his hatred for the princess and wondering who truly was the monster between them. But an unlikely visit one night changes him and his feelings for Celestia...

Princess Cadance noticed how lonely Princess Celestia seemed on Hearts and Hooves Day.

She decided to send a small love spell her way, as motivation to help her find a special somepony, even if it's just for a day.

Cadance immediately regretted it upon finding out who it was.

Special thanks to Mickeymonster for allowing me to use the cover image!

Edit: Mickeymonster has made a colored version of the cover image! Original image: http://fav.me/d4mozkh

Episode filler for "Princess Twilight Sparkle". Discord considers whether or not to help or hinder the ponies in fighting his plunder vines. In the end he decides to be helpful. Mostly. Though Celestia might not agree. Faint hints of prior Dislestia ship but they're not exactly pals anymore. Takes place in the universe of "Last Draconequus" and "Elements of Opposition", not the Discord-is-Q fics.

There is now a series page: Princess Twilight Sparkle Endcaps

Celestia, as the castle knows, as Equestria knows, is dating Discord. They, occasionally have a small fling every once in a while, but it just turns awkward afterwards. All of it, because of Celestia's inability to do it properly. Now, with a self-help tape, she plans to solve that. Unfortunately, Discord finds it and decides, unknowingly what it is, to switch it with a guide on how to cook a turkey.
Hopefully she uses butter instead of oil, otherwise that would just be weird.

After the other two immortals have humiliated themselves with stories, it's Luna's turn now. What mischievous story does she have cooked up for the audience?

Discord has been reformed— mostly. Still, Princess Celestia seems to have trouble controlling what appears to be a seething hatred for him whenever nopony else is around.

When the Princess approaches him one day before a royal ball, Discord begins to see the situation a bit better.