The elf's voice trailed off as he saw that the unicorn's male member had slid out of its sheath, the pink flesh a contrast to the white hair everywhere else on the beast. Dahl watched mesmerized.
It was huge, as well it should be. From simple geometry, a quadruped needs a member proportionally longer than that of two legged creatures of the same weight who make love face to face.
Even for a small equine, the unicorn was three times the mass of a big human male, while Dahl was not even half that. In other words, Merry was eight times as large as Dahl, but with a bigger cock than even a human that large would be endowed with.
Dahl shook his head in denial of what he was sure must be physically impossible. Yet the smitten young man could not tear his eyes away. He stared transfixed by the overwhelming masculinity of the magical equine.
Involuntarily he inhaled the scents of the stable, taking in the aroma of the fresh straw under him, the fresh hay in the manger, the last of the oats in the feedbag, the mildly horsey scent of his companion and something else, something new, something that reached into his brain and set off fireworks, the musk of the male unicorn.
Like a helpless puppet, Dahl came to his knees with his buttocks resting on his heels, presenting himself for oral service to the equine male. He stared the unicorn's cock, by now fully extended from its sheath.
The elf nearly swooned at its raw sexual power. The shaft was too big around for his small hand to encompass. The male member was longer than his own forearm and very warm to the touch as all blood filled it out and stiffened it.
Dahl nearly fainted at the lascivious thoughts that passed through his overwrought mind. This could not be happening, him kneeling in service, in supplication really of an equine.
Yet his own body's response made his true feelings unmistakable. With his own cock painfully engorged and rigid, pointing straight up along his belly, how could he deny the carnal desires surging within him.
The elf shifted closer, still on his knees. His inner voice told him that this was where he belonged, subservient to the larger male, no matter his shape or form.
He moved his upturned face to within inches of the equine cock and stared at the droplet of dew at its tip. Like an automaton his tongue reached out and scooped it up. The taste was much better than anything like it he had ever tasted.
"Yes, young man, taste me. This is part of our bonding, so necessary for our ultimate success, and so important immediately for our own satisfaction. Taste me, lick me, smooch the head, and then take it between your lips."
That is just what the elf did, licking the last portion of the pink shaft, circling the huge head with his tongue, poking the slit at the end with the tip, surprised to realize he could actually get it inside his mouth.
He opened as wide as he could and, careful with his teeth, closed his lips around the purple helmet, tugging and sucking and slurping. He pulled back then smooched the head of Merry's cock once more before taking the entire head into his mouth.
For his own part Merry was incredibly aroused but careful not to thrust forward lest he hurt the young man, especially this first instance of oral service.
He kept still while Dahl, with short back and forth movements of his head, stimulated his cock. It did not take long. Within moments Merry was spitting his seed into the wet warmth of the elf's mouth.
Dahl swallowed much of it, though a lot got squelched out the corners of his mouth. Also, at the last minute Merry pulled back so he shot all over Dahl's pretty face and chest.
That triggered the elf's own eruption which splashed on his belly to join the unicorn's seed. The elf fell back onto his butt, depleted of energy and suddenly fully cognizant of what he had done.
"What happened just now?" Dahl asked, stunned by the enormity of his own actions.
Meirionnydd replied supremely self satisfied. "And don't wipe any of that gism off. I want to look at you as if dries to a crust. No doubt you have questions for me now."
"You bet I have questions, you damn horse! What did you do to me just now? How did you bewitch me?"
Dahl cried out indignantly and tried to stand. Merry butted him onto his backside.
"Get back down on your ass and keep a civil tongue in your head. Besides I like seeing you like that, limbs sprawled, every part of you on display, face and chest and belly covered with my cum and your own, my very own human pet. No, that is unfair, a reaction to your own slur. I am not a horse, nor are you a human."
"No, but I am not a unicorn either! See two legs!"
"Oh, but you might easily become a unicorn in a next life, young one, as I was once an elf. My soul now inhabits it second shape."
"Huh?" Dahl was floored both figuratively and already literally. "Do you mean that literally?"
The unicorn simply nodded with a toss of its head.
"Is that why I, er... responded, I mean physically by uh..."
"Partly from sensing the elf within me, partly just my maleness. Your sexuality responds to that of males of more than your own species, to humans obviously, to unicorns, and to others. And it is just as well it does. Both our bodies and our souls must be united in the great struggle ahead. We will share not only our sexuality but also our thoughts and feelings once you learn to mind speak."
"I didn't think that was possible, with elves, I mean."
"It doesn't happen very often, but it will in your case. Our physical joining will make it happen faster and better."
The unicorn explained that a transfer of his seed to the elf would stimulate the innate magic in an elf's nature to beyond anything imagined by human wizards.
With proper instruction, Dahl would become one of the most powerful wielders of magic on the planet and a champion of life against the dark forces gathering against the living world, including all the planet's intelligent races.
"So if we keep doing what we did earlier, it will help make me a druid?"
"Not quite. The best way to stimulate your magic is with seed introduced during a real mating, a meeting of minds and bodies and feelings, a mounting."
"You want to mount me? Like a stallion does a mare?"
The elf looked at his small frame, especially his narrow hips, and at the unicorn's huge endowment, wondering whether it wouldn't just kill him, split him apart. He suddenly felt very small and vulnerable and naked.
"Actually, it is you who wants me to mount you. You yearn for it, don't you. Search your feelings, Dahl. It wasn't just your mouth watering just now. You were excited at the other end, weren't you?"
Dahl blushed furiously because it was true. His traitorous bunghole had been twitching just then, aching to be filled. Here a damn horse (okay a unicorn) was talking about fucking his ass, mounting him like a mare -- or filly given his youth and size.
As for the notion of his own transformation into a powerful druid, somehow Dahl didn't think a power capable of menacing an entire planet would be overly worried by a nude male elf of a bit more than two decades old, who took it up the ass from elves, humans, and equines alike.
And probably other races in the future. What would it be next: orcs, trolls, centaurs? A small bare-assed elf man dripping the cum of multiple species out of his bung hole would likely not send such a foe fleeing in headlong retreat.
More likely provoke mirth. He told Meirionnydd exactly that, but only got a chuckle out of him, not the rise he expected.
The next day, Dahl woke up feeling strangely energized. With a start he realized it must be the result of ingesting the unicorn's seed. A first inkling then of the transformation Meirionnydd had spoken of.