Part 1, Machine

Princess Celestia, diarch of Equestria and its half-million human inhabitants stood in the window overlooking Canterlot, the capitol of her kingdom. The morning air was cool and invigorating. In the distance she could see pennants swaying in the breeze. She cupped the tea in her hands and took a sip, grateful for both its warmth and its pain-relieving properties.

This was going to be a bad day, she could tell.

She walked stiffly back into her bedchamber sat in front of the vanity mirror. As with any day, this one began with a thorough brushing of her flowing, multicolored hair. She considered the reflection, and decided that at a thousand (plus or minus a few centuries) she still looked pretty good. Her breasts were still large and firm, there weren't any wrinkles that a little magic couldn't cover up and, in her royal opinion, her ass looked as good as it had a half-millennium ago.

There was only thing that marred her otherwise-perfect form. Between the alabaster thighs of the most powerful female monarch in Equestria hung nine inches of prime princess penis.

In hindsight, it was obvious that Luna's disastrous stunt was a plea for attention from an insecure sister with abandonment issues. This is if being-exiled-to-the-moon-for-a-thousand-years-by-your-only-sister could be simplified to a mere 'abandonment'. Maybe Celestia was a little too proud of her star pupil: every evening she forced Luna to listen to Twilight's friendship-status updates and amazing magical discovery reports and embarrassingly ingratiating teacher's-pet suck-up notes. She was could not see that each amazing feat Twilight achieved under Celestia's tutelage only made Luna feel more inadequate and socially inept. Luna saw Twilight as a rival for her sister's affection and secretly hated her for it.

So one evening Luna had enough. She decided that she would prove to her sister that she could perform any thaumaturgical feat that purple twerp could. Before her older sister could react, she found herself the target of a transformation spell of incredible power and emotional complexity. Luna's intent was to give her sister a dramatic but temporary "gift" that she would never forget. And Luna succeeded better, and worse, than she could possibly imagine.

Once the cock-shock wore off, they had an amazing night of discovering the ins and outs, literally, of being a princess with a cock. It was so much fun that Celestia convinced her younger sister to conjure one up for herself. All night long and into the early morning they explored the new and exciting uniqueness of loving each other in a masculine way.

Luna was lucky. By the next morning her modest package had disappeared, leaving only happy memories in its passing.

Celestia's cock, on the other hand, had not shrunk one bit, and neither had her libido. Even though Luna's gift did not include a nutsack, the new addition continuously manufactured cum. It would swell and start to hurt if she did not empty it three or four times a day. It made it difficult to get a full night's beauty rest. Even if she was lucky enough to sleep through the night, as she did last night, it took several cups of aspirin tea to get the swollen cock-ache under control in the morning.

Luna and Celestia tried every spell they could find, but nothing countered the wild, emotion-filled magic that had created the problem.

Luna was the only one who knew her secret, and by default was her only sexual partner. But being the sole beneficiary of a well-hung nymphomaniac's affections was physically and emotionally grueling. Eventually it became unbearable, and within a couple months of the magical disaster Luna had limped out of the castle, every orifice battered and bruised. She promised to continue working on a cure, and would be in touch as soon as she had any success.

She also considered very seriously taking a vow of celibacy.

Luna's parting gift was a magic-powered mechanical surrogate. It was not as comfortable as her hands, but it was faster and emptied her more completely. Celestia took some lotion and greased up her cock, which stiffened a little in gratitude. She slid the lubricated member into a long tube attached the machine, and pulled it snug against the base of her pole. She waved her hand and a tiny magic spark leapt to the machine, which began humming.

Celestia could feel the suction stretching her cock lengthwise, but at the same time the vacuum allowed more blood to fill its erectile chambers. The larger it got, the more it rubbed against the inside of the tube, a continuous cycle of increased stimulation. When the machine released its pull, her member shrank back an inch to its normal, but still very large, size. Again the suction returned, drawing her forward, imitating the penetration of some bodily orifice.

The cycle of suction, release, suction, release continued, pulling her back and forth in the tube. The machine performed its job well, and on a good day she would usually achieve orgasm within five or ten minutes.

The machine would force her to ejaculate again and again, literally sucking the sex fluid from her. It would take nearly a minute to extract a full load of fluid, during which she would orgasm continuously. She usually released a quart of semen per pumping, an amount that had remained unchanged since that fateful day.

The machine was physically efficient, but it got a little monotonous. Although she never failed to achieve a glorious erection, being machine-milked three or four times a day was not very arousing. Lately it had been taking longer to fill the glass jar, and if it took more than ten minutes of tugging she would get a little sore. She discovered that a little fantasizing helped, and sometimes she surprised herself with how naughty her daydreams could be...