As fas as she could, Hailey searched for any means to satisfy her lust. Finally, she came across a storage for the bodies of the users who have become something else. And right there resting on top was a familiar face. She wasted no time in selecting it and opening up the settings. After quickly modifying it to be able to fit her new cock, she saved the changes and the body materialized next to her. With a lusty smile, Hailey bent the body over so their ass was in the air, and proceeded to mount the former body of her testicles.
Before Jeff could comprehend what was about to happen, he felt Hailey shove their cock deeply into his former body's ass. The body gave way and conformed around Hailey's cock like a glove, giving both of them an amazing amount of pleasure. Jeff didn't care anymore that his body was being destroied by Hailey's cock. He was her balls now, and didn't want it anymore anyways. So if she could get satisfaction out of using his empty body like a sex toy, then he would gladly stuff his former body full of horse jizz for her.
Actually, it would be best if she somehow destroied the body, reasoned Jeff. That way she would never even thing about not keeping him as her incredible nuts. If he could spend the rest of his life as her balls, then he could die happily.
While Hailey was fucking Jeff's body, the body began to thin out. Features became less defined, and it even began to turn a but transparent. Seeing this sent Jeff over the edge and he contracted, pushing out the load he had been building and caused Hailey to orgasm. He watched as his body began expanding in order to contain his load as it continued transforming. Hailey on the other hand, lost her support and set her front hooves back down onto the floor.
Now that she was like this, she bent down and looked beneath her as more and more of her cum inflated Jeff's former body, that by now was almost entirely featureless and transparent. Seconds later, the transformation completed, and the horse cock sized condom she had created hung down off the tip of her cock containing nearly a gallon of fresh horse jizz inside of it.
Hailey pulled it off her dick and tied the opening closed. She showed it to her nuts and could hear them excitedly cheer. Having destroied his body. Hailey had solidified her boyfriend's position as her testicles, or any other of her body parts that she wanted him to be from now on.