Change Her Boobs

Your eyes hone in instantly to her bust, captured within that thick coat of fur now. All pristine and white, you can’t imagine a way that a change in size would make this worse. You hastily find the slider “Boobs” which is set at a ‘C’. There’s a lot of room to grow in this slider bar (and a little bit to shrink), mimicking just how much you can make her change. What size do you change her to?