Some years ago, on the day of the Summer Sun Celebration, Nightmare Moon returned from her banishment. The power she had accumulated during her stay on the moon proved to be too great for Princess Celestia, and without the Elements of Harmony to help her, Equestria's ruler was defeated. The land was shrouded in eternal night, and the rigid rule of Nightmare Moon became the new normal.
Then, weeks later, Anon arrived in Equestria via unknown means. Thanks to his natural resistance to magic, Nightmare Moon realized how useful he would be. He quickly became one of her most trusted servants, and she found herself falling for the strange creature. Despite everything, Anon felt the same about her.
Then, after years had passed, six unassuming ponies met by sheer coincidence, brought back the Elements of Harmony, and defeated Nightmare Moon. Princess Celestia returned, as did the mare that Nightmare Moon had been many, many moons ago: Princess Luna. Now, the sun shines on Equestria once more. The land has two rulers and six protectors. Everything is looking up. Everyone is celebrating. Everyone... except Anon. Because Anon did not fall in love with Princess Luna.
Anon fell in love with Nightmare Moon.