Katie's judgement got the better of her.
She knew she should really just leave it for the morning, but what could she do - say "Morning folks, by the way, I grew an extra breast in the night"?
She cupped her original breasts and measured their weight in her hands before testing her newer, central gland. It seemed to carry the better characteristics of both - it was rounder, like her left breast but had a more perkier nipple, like her right. A tweak of the central nipple felt just as good as her others (no improvement there).
Katie stared at her modified frame in the mirror...