With some thinking, he decided he wanted to push this to the extreme. He started working on a change to where everyone would attempt to vore him in some form; He didn't want everyone doing it by force though, so for some variety, he set it up so there would be some that ask first; This would primarily be based on their personality, but also left their relationships into the equation. While he didn't think about it at the time, this would also result in some being too shy to even attempt it, slightly reducing the chances of any vore occurring. He also excluded his parents, but left his siblings in the change.
He went through again. Jeff decided to put a slight bias into where they'd try to vore him, and decided to set it so girls would be slightly more likely to choose either their genitals or their breasts than anywhere else, but only slightly. He then put it in that he would remain unharmed in the process, regardless of how long he may stay inside.
As an extra specification, Jeff made sure that he'd have some way to get out. While they may fight to keep him inside, again putting this based on personality or their relationships, he'd eventually be able to break free from some method.
With the changes in place, Jeff then made sure that it's a manual reversion, and hit accept. The Chronivac made the changes, and spread them out across the entire world, altering everyone's personalities. He'd have to be somewhat careful now; Everyone he meets could try to vore him at any time.