The trip over to Jeffs house wasn't too bad. Hailey did end up wearing the leggings after Jeff pleaded with her too do so. Since Jeff pointed out that she would be able to mildly hide her balls while she rode her bike over, she gave in.
Durring the short 4 minute ride, Hailey was very self conscious, especially since she could feel the breeze on her balls. And while she never would admit it out loud, she was enjoying the feeling it, a lot. When she got to his house, she snuck inside and quietly entered his bedroom. She carefully sat down in his chair, being sure not to accidentally sit on her balls, and opened up the Chronivac's interface.
This is when things began going differently than she had planned. It turned out that Jeff was in something like a trial run, and it was an unstoppable decision that lasted a full 24 hours. In other words, Jeff would be staying as her balls for an entire day and night. Hailey was less than happy to learn this, but what more could she do but accept it. Then she got curious.
After looking through the settings, she learned that while she couldn't undo what he did, she could modify parts of it. So first of all, she turned on the reality easer, which made others treat their situation as normal, while making herself the only person who Jeff could speak with directly, even if he was talking out loud to her.
But then she got a bit playful. She upped the linking of their senses to the max, allowing them both to feel 100% of the pleasure the other was experiencing. She also removed the pain she could feel if Jeff got bumped the wrong way or if she accidentally sat on him. She also made it perfectly acceptable for herself to be publicly naked, though it still could be taken as her being impolite in certain situations.
She was having quite a bit of fun and possibly had gotten too carried away. At least, that was her immediate thought after she turned her own clitoris into a full sized horse cock. Complete with sheath and everything. Jeff and her pussy were still right beneath it too.
Jeff didn't mind any of it though. He was oddly content being his girlfriend's balls. He felt comfortable hanging between/behind her thighs, like it was his own spot on her body made just for him. He didn't even mind when she made him swell up a bit more to match her new horsecock in scale.
Hailey sat on Jeff's bed, one hand stroking her new cock, while the other cupped and played around with Jeff. Jeff was having a great time, and without even thinking of keeping them to himself, blurted out his current thoughts.
"Oh yeah, I love being your balls Hailey. And now that I can feel it, you are doing great at rubbing your new cock too. Part of me now wants you to keep me as your balls, while another part wants you to give me a mare pussy and fuck me when I turn back to normal. Weird right?"
Hailey was caught a bit off guard by this, but the thought of screwing ber boyfriend in his mare pussy was getting her more turned on than anything she had been thinking about beforehand. "Sure, I can't fucking wait to breed you as payback for giving me balls." Agreed Hailey as Jeff couldn't take it anymore and squeezed all the semen stored inside of himself out.
This of course caused Hailey to spray cum all over his bed and floor as she hadn't expected how little control she had over her cock during an orgasm, nor how fast her cum would shoot out of it.