Even with the transformation, Danielle was not happy with her current condition. "Hm... if only I could take revenge on my sister... and in a very gooooood way...~", she thought. Then, it hit her.
Kat's breasts were too small.
That was her chance.
Danielle had gained some magic from the transformation, and decided to use it. She pounced onto her sister, squeezing her breasts in the process. But what did not know, or certainly couldn't feel, was that Danielle was slowly entering her breasts, both nipples. It went like this for a while, until, at least from Kat's point of view, Danielle was gone. But... she also noticed something else.
Her tits had grown to a D-cup, with her nipples pointing through her shirt.