After Britomart came to Chaldea and was appointed an Expeditionary Faerie Knight, Britomart was free from her stuffy armor for the first time in a long time and could sleep comfortably.
When she woke up the next day, she was very embarrassed for two reasons.
The first was that she overslept until her lunch time;
The second is that her body - perhaps in the aftermath of being liberated after being oppressed by her armor for so long - has 'liberated' unexpected parts of her body.
The liberation continues, and eventually her Hyperbreasts and Hyperballs continue to grow...