Part 3, Sister

One of the naughtier fantasies involved her little sister. That first night, when they both still had their magical penises, they tried every possible combination of sexual roles and positions. Luna's more-human sized cock had not been able to friction inside Celestia, so the older sibling graciously offered her puckered rosebud as a tighter alternative. It had worked, stimulating her sister enough so she could find release, albeit on Celestia's face and voluptuous breasts.

Unfortunately, Celestia's much larger member was not compatible with her smaller sister's butt, so she was not able to reciprocate. But that did not stop her from fantasizing occasionally that Luna lay before her, her cute behind raised and beckoning. Luna would reach back and spread her cheeks, wordlessly broadcasting her willingness to be mounted from behind.

In her more loving fantasies, Celestia would lean in and touch the forbidden flower with her tongue. Luna would groan and push back, demanding more. Celestia would kiss and lick and drool over her less-used love hole, eventually working one of her long, delicate fingers into Luna's now well-lubricated anus. Then she would insert another, and yet another.  She would work them in and out, loosening Luna's rear.

When they both were ready, Celestia would press herself against Luna. The younger sister would hesitate for a moment but then relax her well-lubricated rear, allowing Celestia's large shaft to penetrate smoothly and deeply.

For a long time they would rock back and forth. Luna's tight ass ring would stimulate her sister's cock while the long, hard cock massaged Luna's bowels. Celestia would share her pleasure by reaching around and taking her sister's magic prick in her hand. She would stroke it firmly in time with her own thrusts, feeling it twitch and swell as Luna became more and more aroused. The younger sister would plead for release and the older sister would provide it, milking her until all of Luna's fluids spurted onto the bed sheets. Luna's orgasm would tighten her asshole, in turn causing Celestia to achieve ecstasy, filling her sister with her warm juices. The two of them would stay joined together until Celestia deflated and slipped out.

Sometimes the fantasies about her sister would be more aggressive.  At first Celestia would reject Luna's anal offering, instead making the junior princess service her orally. In this fantasy she was too large for Luna's mouth, so the submissive sister could only lick and slobber over the thick shaft. When she was ready, Celestia mounted the little princess, eliciting a whimper of discomfort as the saliva-lubricated member found its new home.

Celestia sodomized her sister with a masculine ferocity. There was no concern for her pleasure.  While she would never hurt her sister, some level of discomfort could be tolerated, and in fact, desired.

She was driving hard now, thighs slapping against ass, the bed shaking with each lunge. Luna's face was contorted, hoping the violent sexual act would end soon.

Celesta, however, wanted the elicit thrill of anal intercourse to go on and on and on. But the male part of her screamed to finish the act, to achieve the ultimate possession of her sister. As she felt her body tightening she slowed her pace but lengthened her stride. At the moment of greatest urgency she would throw herself onto Luna, burying her cock as deep as possible in Luna's behind. Celestia would thrust and rut until every last drop of cum had been spent.

But today Celestia, co-ruler of Equestria, decided to go with the palace guard fantasy. He would be of medium build, with curly brown hair. He would be married with two small children. His wife would be the maid who changed the sheets in the royal bed chambers. She might or might not suspect anything...

Celestia waved her hand over the machine.  Another spark of magic leapt from her fingers and the suction, release, suction, release became faster. She closed her eyes and the guard, knees shaking, was disrobing before her.

Maybe the day wouldn't be quite so bad, after all.