The thought to stay or go was tossed around in Cody's mind before Jace's transformation was fully underway, but the sight of his new dad regaining his age was too fascinating to not stay and watch.
At this point Jace was sitting at about 25 as he continued with great effort to pull a pair of shorts on to give himself some decency. They finally came over his thighs, but as his body continued to age, it also pilled on more weight. As soon as they were in place a loud rip from the fabric was heard, and Jace continued to swell with more fat.
Jace's stubble continued to grow outwards as he passed by 30 and climbed towards 40 becoming a full beard covering his emerging triple chin. While his facial hair thickened, his hair receded, leaving him bald.
With no clothes on Cody could see Jace's body hair grow out into a dense forest covering his belly, moobs, thighs, and arms in a dense layer of dark fur.
The man sighed with relief as the transformation stopped. Leaving him stark naked in front of his son.