https://www.amazon.com/dp/B07Y1RPW3T
As Lyla's assets continue to grow, so does her notoriety. Unfortunately the censor board, jealous wives and girlfriends and rival cheerleaders want to take her down. Her best defense is a powerful offense as she reaches epic proportions, so she uses her ability to promote growth and expansion in her closest friends and strategic people in the organization to take some of the heat off of her.
This is the 2nd of a series.
Here is a link to part 1, both stories do feature breast expansion:
https://www.amazon.com/dp/B07NY9C6M6