Kelly starts getting cocky, acting differently.

For a time after Jack's mother developed her new appendage, things were relatively normal. She did her best to cover up her new bulge and pretend it wasn't there, which was easier said than done as it seemed to have a habit of trying to make itself known as much as possible. Strangely, this turned out to be irrelevant, as whenever it became obvious in public, no one batted an eye at it. Only Jack and his mother seemed to find the fact she suddenly had a giant dick weird.

Jack's mom had to adjust to her new girthy cock, of course, frequently bumping her bulge into things and letting out inappropriate moans. However, as the days went on, Jack began noticing a change in her behavior. She gradually became more used to moving around with it, she seemed increasingly comfortable with having it, and even seemed more confident than she was before her change. What really struck Jack though was how his mother seemed to start to want to flaunt it instead of hide it. She'd wear tight pants that it visibly bulged out of, or skirts that were too short so you could see the swell in her panties. And she seemed to get excited at how obvious it was.

Then he woke up one night to the sound of her loudly masturbating. He didn't say or do anything, but he couldn't get the thought of her slapping that monster cock until she burst a massive load of cum all over herself out of his head. It was disturbing to say the least. After that, she became much more overtly sexual, openly rubbing her bulge when turned on without shame and hitting on attractive women, who seemed to have some instinctive desire to want her cock.

Jack was worried, having no idea what was going on with his mom as she quickly became a completely different person. And then, one day, things got weirder.