As Luna began to purr, Toothless felt totally relaxed, and closed his eyes, licking his mate's pussy affectionately. But Luna was glad that he closed his eyes, continuing to purr from excitement and pleasure... and to lower her mate's guard. He must not understand what is happening to him, while he is still big enough to fight back...
Toothless was oblivious of what was happening to him, as he was licking and licking her sweet nectar. It tasted... much more pleasant that before, he thought, but didn't pay much attention to it. The Night Fury at Light Fury's pussy was in fact getting smaller after each lick he made. At first the process was intermittent - his body compressed for some percent of his previous size for some seconds after his tongue returned to his mouth, but in some minutes it smoother out, and he was now constantly shrinking a small fraction of his previous size each second, enough to make it visually noticeable.
Toothless had to re-adjust his pose after some minutes, as Luna's vagina was strangely getting out of reach. He stopped licking it for a brief moment, making Luna nervous, but luckily for her didn't open his eyes and quickly found the sweet spot by his sense of smell, bumping his nose into it and sniffing the pleasant scent (which, again, was strangely more pleasant than usually, but he wasn't questioning it, and was happy).
Luna was reassured that he didn't notice anything yet, and grinned. Soon her Alpha mate should be small enough to be easily overpowered by her, and she will then finish the process herself... She licked her lips imagining it, continuing to stare at the slowly shrinking Night Fury by her tail, who was now just a little over a half of her size, and let out an especially cute and loud purr, making the unsuspecting dragon at her lower regions fill with joy, and give her an especially long, powerful and unusual lick, which she appreciated.
She knew that Toothless closes, and doesn't open his eyes while he pleasures her. It was a strange trait of her husband, that she made good use of now. She only hoped that he wouldn't question the ever-increasing distance that he had to reach for to her vagina, while he is still not small enough. Just some more minutes...
It was a rare, secret ability of some of the Light Furies, to change the size of creatures that ingest their juices, especially sexual ones, when they want it. Not all of the Night Furies were killed by the hunters, in fact. Some... have disappeared after finding a Light Fury mate. Maybe some of the shrunken ones are still alive, having run away from their mates, and surviving somewhere in the wild. Maybe some of them were lucky to get a mate that just wanted to safely play with their tiny lovers, or protect them, feeling their lives in their... paws.
After some more minutes of affectionate licking from her increasingly small husband, Toothless started to stir. He was now just a little over one third of Light Fury's size, and now had to bend his body over her tail, to reach her vagina, in a way that he just couldn't leave unnoticed. Moreover, her sweet folds were now covering a strangely big part of his muzzle, as he was nuzzling it gently.
Toothless lifted his head up, which made Light Fury bite her lip, and tense her muscles. He opened his eyes. "Luna, I don't know what is different, but you taste totally amazing toda..." - he didn't finish his sentence, as he noticed that Luna's muzzle seems strangely far away, and her torso seems to stretch for a too big distance away from him. He then looked down and around, and noticed that he was surrounded by Luna's hind legs, which were too big for him, almost comparable size with his entire body.
"Luna, what's going on?..." - Toothless asked, preparing to back away from her, slowly lifting from her body. "Why do you seem so big?"
"It's not me who is big, my silly love. You got smaller!" - she ended her sentence with an excited sound. "Sorry, husband, but you are not going anywhere" - she added, as she noticed him beginning to turn, and preparing to run away. Luna quickly put both of her hind legs over her small lover, and pulled him closer, back to her awaiting pussy.
"Luna, what is happening? What are you doing to me?! Let me go!!!" - he said out loud, almost shouting the last words, as he noticed that he is not strong enough to break free of her massive legs grasp.
"Silly Toothy, I told you are not going anywhere. You are mine, and I want you to continue what you were just doing"
"Luna, that's not a joke! What are you doing to me?!" - Toothless screamed to her, but his last words were muffled, as his lover pushed his muzzle into her vagina, which she spread a bit with her other paw.
"You liked to lick me, right? Then just continue to do it, and don't question me. You will like what I have planned to you, my love. You will surely like it... and me too".
Toothless tried to struggle, but the hind legs of his mate that were holding him were just too strong for his almost hatchling-sized body. He let a bit of his lover's juice get into his mouth again, as he was trying to break free, but then shut his mouth. He still had to breath though, and Luna positioned his nose in a way that his nostrils were touching the wet folds, and some of the liquid inevitably was getting into his nose as he was breathing. Much, much less than when he was licking it, of course.
"I told you to continue licking. You either start doing it again, and we finish it quickly, or you I will hold you like that for hours, and you will still likely shrink to the size I want, by breathing in humid air of my pussy. There is no use in struggling, just do it." Luna didn't know for sure if just breathing the air, humid with her juices, would be enough to shrink a creature, but she wanted to make him feel like struggling is pointless... somehow. "You know, maybe I should just force open your mouth, and pour my juices into it? Or saliva. It will shrink you too, did you know?
"Luna, we did it many times before, and kissed, and had sex... Why didn't it affect me in this way before?" - her lover's muffled voice could be heard from her pussy's lips.
"I didn't want it to" - she replied.
"But why do you want it now? Why didn't you tell me you can do it?"
"Well, simply because..."