It is often said that absolute power corrupt absolutely and, alas, Jeff became one more proof of it. Galvanized by the alterations he had done to his love-life and how reality corrected itself to make it possible, he decided to make more changes, but not on himself this time.
No, instead he opened his wife profile on the Chronivac and started by removing her awareness of it, along with all memories of how reality used to be. Then, he changed her age to ‘only’ 42, but added a mention that she was a very good and sharp lawyer, that was already an associate in a very prestigious cabinet within a year of obtaining her diploma. Then he used the mention of her ex-husband, (Shannon's father, since reality was changed at least) to turn him an alcoholic, make it so it was the whole reason Jennifer had divorced, and that he recently died from a cirrhosis. He couldn't let him take away his step-daughter after all, it would ruin the plans he had for her!
At first he wanted to make it so he was married to both mother and daughter, but changed his mind. Instead, he made her so starved of a father figure that she latched on him to fulfill that role. Not that she wouldn't find disturbing the fact she unconsciously cast a classmate, someone her age, into that role, but Jeff is her mother's new husband, so that theoretically make him her new (step-)father, right? And just to confuse her more, he didn't erase the crush she had on him.
Being a boobs kinda guy, he also altered his step daughter to reflect it, making Shannon's chest having the same size than her mother's ones were at the same age.
Then, back to his wife's profile, he turned things so Jennifer would be perfectly fine with him taking Shannon's virginity. Not that he wanted to at the moment, but if that changed, he wanted the option to be open. Then, knowing she would sooner or latter rediscover the Chronivac, he made it so she would be happy with all the change he made, and even glad he made her forget the ‘dreadful’ old reality.