My girlfriend asked me to help her finance her breast augmentation surgery, what should I do?

I have been dating my gf for four months. I enjoy her as a person and I am very attracted to her. I find her gorgeous. She has an image issue and wants a bigger cup for her breasts. She is an A and wants a full C. Issue is, she wants the surgery and is wiling to do just about anything for it. She offered me whatever I want. I have concerns about this. What should I do?