"I wish I had C-cup breasts," Karyn said. This way, it wouldn't conflict with her previous wish of having bigger breasts, because she originally had B-cups and C-cups were bigger. She was just being more specific, which was allowed.
The stone glowed and Karyn was relieved when she felt her too-large breasts shrink to a more manageable size. She smiled and turned towards Jon. But before she could say anything, Jon sprinted towards her and violently pushed her towards his closet, denting the bi-fold doors in the process, and seriously injuring Karyn.
Jon looked down at the now-unconscious Karyn in shock. "What ... what did I just do?"