Jeff focussed, and managed to break through the 'Jeffy' persona once more. He could regain control for short periods, as he had found out earlier that day, returning to his normal, completely human, personality. Even better, when he took control, he could change to dog form at will.
He could see Ken's friends, Zack making out with a male blow-up sex doll, but he couldn't see Ken. With a little more focus, Jeff accessed 'Jeffy's memories and discovered what Zack had done to Ken. Fortunately, Jeff had used one of his active times to program the chronivac to change Ken as retribution for what he had done. Of course, Ken had been punished enough by what Zack had done, but the program could be used on Zack as easily as on Ken.
Zack was clearly indisposed with his 'Ken doll' (Jeff allowed himself a chuckle at the joke of it), so Jeff changed into his dog form and walked slowly over to the chronivac, discreetly enough that Zack did not notice. Changing part way back, Jeff activated the program while pointing the chronivac at Zack.
With Zack's change started, Jeff turned the chronivac on himself and activated the second of his programs. Jeff could feel the other personality, 'Jeffy', disintegrate, and Jeff breathed a sigh of relief. He had full control now, and 'Jeffy' would never return.
After a few days, Jeff decided, he would change Ken back, and then subject him to the same change that Ken had subjected him to. It would be fun to order his older brother/dog and be obeyed.
Jeff turned to watch Zack's transformation into...