Two mares and a comet (Private with Princess Cadence)

[ThePaddedAmby]

Luna sat on her balcony, it was cool winters night and the sky was clear. The princess sighed and looked to the streets below. Most ponies were asleep around this time, but She didn't care. The only mare she was looking for was Twilight. Tia's student had planned for some 'comet watch party' as she called it. The comet itself was a pretty rare one indeed, only making it's way past Equestria every hundred years. She had seen the comet only a few years before she had been sent to the moon and was quite eager to see it again. Luna smiled, still looking at the streets below. there was still four hours until the comet would pass. Usually Twilight would have come earlier to set up her gear. "What could be taking her so long?" She asked herself.

[Little Cheetah Cub]

(Before or after she got her wings?)

Twilight was happily trotting along. She had everything packed. She had unfortunately been held up by a hyper Pinkie Pie. It was getting late and Twilight looked up at the Canterlot Castle that had finally come into sight. Her saddle bags had all her viewing equipment in them. She was supposed be see Luna this night. The comet that was coming into view was a very rare one. The Princess was waiting for her. Twilight after a few minutes huffed her way up to the castle door and rung the bell.

[ThePaddedAmby]

(After)
A royal guard opened the massive door to the castle, With a salute he stepped aside. "Welcome princess sparkle." The guard greeted her. "Princess Luna has been waiting for you. she has requested me to tell you to come right in." The Guard informed her, stepping back and letting the newly crowned princess go.

Luna stayed in her room, finally putting on the last tapes of her diaper. It was an odd fetish for a mare like her but it was a type of stress relief to her. Twilight hadent gotten to her room yet and it had been almost an hour. Deciding it may be a few more minutes, she had decided to indulge in her little secret. Putting a hoof to the front of her diaper, Luna began to massage the area, letting out soft moans.

[Little Cheetah Cub]

Twilight shook her head at the guard. She started the trek up to Luna's room getting there much much faster than she had expected. Twilight raised a hoof and gently rapped on the door before groaning. She had set of a few days before so she could walk instead of taking the train. Being a princess this would normally be frowned on. She had yet to try out her wings much though and the walk gave her a lot of time to practice. Rainbow Dash had been trying to teach her how to fly but Rainbow still had the mind set of a Wonderbolt so she was not at all patient with new flyers. So by the time Twilight had finally gotten to Luna's room sher was panting extremely heavily.

[ThePaddedAmby]

Luna hadent heard the knock, still in her own world as she continued to massage the front of her diaper. She hadent recalled if she had told the guard to inform Twilight to just come in. Hopefully she didn't. This had been a nightly routine for the princess, Usually she would wake up, raise the moon, indulge in her little fetish then get straight to work on whatever had her attention for the night, whether it be paperwork or video games. Not surprisingly, video games had almost always taken her attention.

[Little Cheetah Cub]

Twilight sighed and knocked harder. She laid down exhausted. The walk was beyond long.

[ThePaddedAmby]

Luna finally finished, taking a deep breath. Looking to the door,she had finally heard the knocking. The princess walked over to her bedroom door and opened it completely forgetting the fact that she was still wearing her diaper. It had been pretty common for her to wear it even after she had pleasured herself. Usually it would stay on until she would go to bed for the night, staying on while she played video games or just did paperwork.

[Little Cheetah Cub]

Twilight slowly walked into Luna's room. "Thanks for allowing me to stay here Luna" After Twilight set her bags down. She turned to look at Luna and her mouth fell a gaped. "What are you wearing?"

[ThePaddedAmby]

"It's no problem Twilight Sparkle." Luna commented. Her speech was still a little off, Like calling Ponies by their full names, but at least she was still working on it. "I was excited when somepony other then Tia had taken interest in the Centurium comet. Luna then rose an eyebrow, hearing Twilight's question. "What are you talking about? we are wearing..." Luna immediately went red as she remembered that she still had the Diaper on. Quickly grabbing the blanket on her bed, Luna hung it in front of her so Twilight couldn't see what she was wearing. "W-We are wearing nothing Twilight Sparkle."

[Little Cheetah Cub]

"Luna I suggest dropping the blanket as I have already seen." Twilight shook her head not believing that Luna was hiding things from her. "And I told you before to call me Twilight...Not Twilight Sparkle." She sighed and slowly walked over to Luna before grabbing the blanket