And grow they did... A bit.
After a few moments Joanna lost her concentration and the glow subsided. Her breasts were larger, but the difference was almost unnoticeable.
They were almost out the A range, perhaps barely B's. Her efforts had added maybe an inch to her bustline. In any case, her bra still fit and Joanna was not happy.
Why couldn't this be easy? Did her powers even work? Evidently they did, but it seemed like the crappiest possible version if this is all that she could do.
She almost felt like giving up, right then and there.