Where Is Part 2!!!
all that nourishing chocolate!
Since the other people replying to you aren't actually answering your question, I guess I'll give it a try.
Growth is a common subject of erotic fascination. While in real life growth tends to be painful, in erotic fantasies it is often portrayed as being very pleasurable. Fat is a big target of this feeling, especially because it is warm and plush, which are qualities that most people tend to like. And the thought of pressing oneself against such a mass of soft flesh is...rather exciting.
I could write an essay on all the nuances of fat fetishes, but I'm sure you're not quite that interested. I hope my brief explanation has helped you wrap your head around it somewhat.