Giantess Growth in BE Story Club comics

"The Master's Way" and "Stranger than Fiction" both feature giant, dominant women. 

The latter actually features several tiny, waifish girls growing to amazonic stature:

1. a formerly bullying girl has her stature reduced (leaving her so extremely puny that even her un-transformed former victims are easily able to push her around as a petite-but-tough girl who challenged her grows into to a muscular, busty amazon, a head taller than anyone else standing nearby.
2. football players used to having their own way are suddenly intimidated when a female jock is 'enhanced' to about seven powerful feet tall
3. the cute little Asian chick who is president of the local anime club becomes a staggeringly busty mini-giantess, as does the protagonist's girlfriend

http://growthcomics.com/content/the-masters-way
http://growthcomics.com/content/giant-breasted-giantesses

The focus in Stranger than Fiction is more on height and boobs yielding dominance rather than on muscles, but there is a little bit of muscle growth on display.