A fatter royal attendant.

You scan the room, trying to think up a wish, when your eyes lock on Rodrick. More specifically, his heavy protruding belly and wide bulging ass. Your cock stirs as you see it jiggle and slosh with every movement the dragon makes. You know exactly what you want. You feel a power flow through you, it feels like shimmering starlight coursing through your veins, washing across your whole body. Your mind laser focuses on Rodrick as you imagine him much fatter.

A faint blue aura rises around you and then the object of your desire. Suddenly, Rodrick slowly starts to expand fatter before your very eyes. He's a bit confused at first but his bewilderment quickly transforms into enjoyment as he watches his fat belly inflate with more blubber. A wide smile grows on Johan's fat face as he watches the spectacle with excitement. Slowly and steadily, the dragon's frame grows wider and softer. The sash tied around his waist snaps and spills out of his billowing tunic as his already massive gut extends further out and sags down even lower below his lard swaddled knees until it nearly touches the cobblestone floor. His clean white pants tear themselves to ribbons as his fat ass grows bigger and wider, the two colossal scaly cheeks parted by an equally as fat tail that acts as nothing more than extra fat storage rather than a useful appendage. His tunic becomes barely anything more than a bra for his swollen watermelon sized moobs. His angular draconic face softens with a pair of lardy chipmunk cheeks as they rest on the doughy rings of fat that used to be his neck. By the time the transformation is done he looks as big as Johan, a wobbling pile of blue and gold scaled flab littered in the shredded ribbons of fabric that used to be his clothes.

Johan laughs. "Hah! Well done, ______, you're a natural at this!" he starts to use his mage hand to record the results of his experiment in one of his journals and Rodrick gives him another piercing look from the spot where he's immobilized "That's 'Your Highness' to you." Johan ignores the comment, too interested in his writing "I'm sure I have a spare wand around here for you." Drawers and cabinets open and close by themselves as the wizard searches before finally a simple wooden wand capped with a small crystal floats its way over to you. Your childhood dream of being a wizard has finally come true.