Empress feeds you twinkies POV and talks about how much she loves growing and expanding your big belly. It grows in front of you to massive proportions, while Empress remains he skinny self and admires her handiwork. You let Empress fatten you, because you know a weight shifting spell. When you've gotten big enough, you whisper the spell, and Empress begins to pile on all of the weight that she had packed onto you. You shrink visibly as she grows enormous. When the spell is complete, Empress is furious, and dominates you with her newfound size.