Take the yellow potion and return to your quarters

It's extraordinary, the feeling of Rodrick's sweaty scaled blubber in not just your physical hands but in your several mage hands as well as they grope and smack more of his draconic dough than you could have ever done as a mundane human. You're learning fast that magic is as simple as willing your desires into being. It's as natural as breathing, which is heavy and lustful as you feel every curve, roll, and fold of his body all at once, it's divine. Your cock throbs and aches and the more you stare at his fattened face and listen to his bashful moans as he's manhandled all over by his king, the more you realize you don't just want him. You want to be like him. Your old life and old world are gone, and even though you've only lived in this world for a few hours you can't imagine living anywhere else. You're already a king and a wizard. Why cling to being a plain and boring human when you could be a fantastic creature like him? You holster your wand in one of your pockets and turn back to Johan, still watching the both of you like a hawk.

"Thank you, Johan, your tireless work has made your king so happy, but if you'll excuse us. I'd like to return to my quarters for... a personal meeting with Rodrick."

You say with surprising poise for someone who has been king for less than a day and reach your hand out towards Johan to levitate the vial of yellow potion over to you.

"I'll be taking this as well. I'll be sure to return later to let you know how it worked out."

Rodrick looks at you with bedroom eyes, he knows exactly what you mean as always. You slip the potion into your pocket as you practically throw yourself onto the dragonborn's mound of a gut. It's so soft and more comfortable than any throne could ever be. You cup his fat cheeks and lock lips with his snout to begin passionately making out in between heavy lustful breaths. Before you lose yourself entirely to passion you slip your wand back out and tap his lard with it, a clear picture of what you want in mind. Your combined masses shimmer with faint blue light before the dank subterranean chamber around you fades out into a nebulous mass of stars blue smoke before fading back inside your bedroom. The dragonblob just where you want him. In your bed.

Once you're both alone he immediately starts to undress you. You stop your passionate kissing for a moment and before he can get his words of confusion out you silence him with a gentle finger on the lips as you draw the potion back from your pocket. Your hands tremble a bit as you pop the cork out of the vial and bring it to your lips. A tiny voice in the back of your mind tells you you shouldn't be making such a rash decision in a nymphotic mania but it's too little too late as you shotgun the entire tube of polymorph potion with thoughts of dragons filling your mind.

Your whole body tingles as it washes over with a powerful electric sensation. Within seconds you feel everything starting to change. Your skin is overtaken by golden scales which grow over it like a suit of armor with similar plates of platinum white scales come into being on your belly and moobs. Your hair recedes and disappears as curved ivory horns sprout from your head and your face elongates into a angular snout just like Rodrick's. Your hands and feet shift and sharpen into a set of reptilian claws and talons. You feel your pants strain as you sprout a new and meaty tail that shreds through their seat and slaps Rodrick's blubbery gut as it flops between your meaty thighs. You feel more confident than ever in your new body. You don't even need to look in the mirror to know you're perfect.

"I never knew you wanted to be a dragonborn, ______" He remarks, so in awe from your transformation he referred to you by name.

"Neither did I." You reply before resuming your fervid kissing and Rodrick continues to pull off all your clothes.

Once your new draconic body is completely free of its fabric shackles you feel your leaking cock pressing into Rodrick's blubber. He's so soft you could probably just fuck his fat anywhere. Your hands slowly creep down from his pillowy cheeks. Feeling the soft rings of fat around his neck before finding his heavy fat tits which you grope and fondle roughly. Soon they run down further, tracing the broad curvature of his belly, to squeeze the thick blubbery rolls on his sides. Everything you touch is ecstasy, you just can't take it any longer.

You grab his bloated lardaceous thighs and, with the help of about 6 extra mage hands, roll the immobile dragonborn onto his back. He doesn't protest at all, he just lays there panting and moaning desperately as you straddle his fat tail. Under his massive quivering belly you can finally see his cock, or lack thereof. All you see is the brawny leaking head of his meaty cock as it sits nearly swallowed whole by his blubbery fupa. Seeing such a mighty shaft reduced to nothing more than a pathetic sunken head struggling to breathe as it drowns in fat. It just makes you want him even more as you practically lunge forward to shove your face in the squishy pad of pubic fat. You have to push the lard back to even get his thick cock head into your mouth so you slip your new long and agile dragon tongue into the soft fold to lap and coil around his sunken shaft which only makes Rodrick pant and moan harder as he experiences a pleasure he hasn't known in a while. As you continue to blow the dragonblob you bring your hands up to knead and massage the mountain of buttery fat that is his belly. Meanwhile, you can hardly take the feeling of all this fat around you as you feel Rodrick's tremendous belly shaking and jiggling against his face as you tongue his cocklet, his enormous thunder thighs slapping against your own massive belly, and his lard filled tail between your legs grinding against your cock. Being fat feels better than you ever imagined, and being with some one even fatter just amplifies it all ten fold. After a few minutes of passionate tonguing Rodrick bellows a moaning fireball upwards and bucks his blubber swaddled hips weakly as he pumps a thick load of salty dragon cum into your maw which you happily swallow.

That was just the first course however, as the king still needs to blow his own load. You shimmy your way up closer to him, poising your cock right at the entrance between his lardy thighs, beneath his pudgy fupa. You practically throw yourself onto his belly as you shove your cock into his willing hole. It feels amazing, but not as amazing as your bellies pressing together as you worship and bask in the glorious fat you've been obsessed with for so long. Every time you slam yourself into him it sends a wave rippling through your combined obesity. Every jiggle you feel, every roll you grab, every fold you find, it just drives you crazy for more. The sound of your moans and fat scales slapping together can be heard throughout the castle. You pant and wheeze, your bulky body struggling to keep up with the intense work out you're giving it but still you press on. Soon, Rodrick gets an idea and curls the tip of his flabby whale tail closer towards you until you feel its fat tip caress the cleft of your ass, curiously prodding between the cheeks a bit. You let out a snarl of approval as you continue to plow his ass as hard as you can manage and within seconds you feel the tip of his tail slip between your cheeks and penetrate you. Your knees nearly go weak as you feel it wriggle a bit inside you as it pushes itself in deeper and deeper, growing thicker the further it goes. You groan as you feel it spread your hole wider and wider with each stroke. By the time Rodrick's tail's flexibility ran out, he was roughly 18 inches deep in you, his tail the thickness of a medium tree trunk spreading your hole to its limits. It was a struggle but a good king must take cock as well as he gives it. All of it is just too much for you as with one final heavy thrust you slam your cock as deep as you can into Rodrick's hole and pump a nice pint of cum into him.

You practically collapse on top of him when you pull out, a pair of panting sweaty messes of noblemen.