This story was inspired by the story Comic Control with some changes of my own.
Prologue
Two rings that made any person full of lust. The creator of these objects was long forgotten. The rings' purpose was to conquer the world with only one man and his mate as his equal ruling the world. The rings knew who were their champions and the ones more probable to sussed and were now going to them to change their lives right now.
Harry Potter was not a happy person right now. Last night he was chosen as the fourth champion for the tournament and everyone, including Ron, thinks he did it as an attention seeker. The only one that was still on his side was Hermione and he was grateful for that, especially with the feelings that he had been having since the end of the third year.
The two of them were in an empty classroom discussing a schedule for his training. They were just finishing when on the other side of the room something was calling them.
In a zombie way, each grabs one and then they return to normal. Without noticing the rings they return to the dorm and went to sleep
That night both of them change mentally and physically.
Physically both of them became the sexiest of their respective gender. With Harry becoming taller, 6.2 feet in height, a muscular and lean body, and his dick grew from the average 6 inches to 10 inches.
Hermione also became taller, 6 feet, her breast wend from B to F cup sides, hourglass figure, bubble butt, and a beautiful little straighter hair that went to her butt. Their change can only be noticed by them and their future slaves.
Mentally they became in love, but with a desire to dominate and make slaves from everyone they knew without any remorse. Magically they received powers that only they can use for their conquest.
The next morning was Saturday, so no classes. The new couple woke up early and went again to the unused classroom to talk.