The siblings betray Mary and Sara

"Why don't you and Sara go first? Me and Arthur will need to monitor and adjust the controls if anything goes wrong." Anne suggested.

"Of course, can't wait to see just how much more power we'll have" Mary responded. She and Sara climbed onto the platform and watched as Anne engaged the controls. The machine had almost no moving parts, and so as it activated the noise it made was mainly of the humming that it's cooling fans made as the power coursing through the machine began. As the seconds ticked by the two girls continued to anticipate their new power up, and the promised ecstasy that was sure to come with it. However their hopes and dreams were quickly dashed, as suddenly they noticed they were getting smaller.

"Hey hold on somethings going wrong!" Sara shouted. As she and Mary moved to escape the platform they were suddenly held in place by an invisible ****.

"Oh no somethings going right." Anne purred as she used her psychokinesis to hold the girls in place. It was a strain at first but soon the danger of them defying her passed. Mary and Sara's faces were in anguish at their situation, suddenly being **** into sexual sobriety as their body's shrunk and their pleasure and arousal evaporated. Their muscles seemed to deflate as their sinews shrunk and their bodies reverted to their original frames. Their shapely breasts collapsed quickly to their former size, with their butts suffering a similar fate as they flattened as well.

Anne finally released them once the process had reached it's end, as it had resulted in the two girls shivering and shell-shocked at their return to being mortals. Anne soon answered the questions they had but could not speak in their reduced state.

"It was very nice of you Arthur to distract them while I modified the machine to also remove their power." Anne congratulated her brother. "It's quite lucky that my telepathy made that little subterfuge so easy. However it's a pity they had to suffer this. They gave us so much and were such great friends. But there can only be one goddess if this power is to be harvested for the sake of peace. Perhaps we'll make it up to them later?" His expression was mute at the monologue. He knew it was only about the power, which was now there for the taking.

Arthur quickly moved the girls away from the machine and restrained them by bending some long metal scraps around their arms and legs. Anne wasted no time readjusting the machine to its true purpose and as Arthur rejoined her side, they had entered the platform.

"Now time to see what true power is like." Anne said, and she remotely activated the machine.