Like with everything in life, "big" is relative. On a tiny girl, a set of C-sized tits will look huge, while on a big 6 foot tranny, they will look tiny. So we go by look rather than by size, although we try to stay above D-cups.
Bring her on board! Please have her contact us, and we will be more than happy to feature her. We are always looking for fresh tranny faces (and boobs)