Can I get natural looking breasts with 700cc's? (Photos)

Thank you for the question and pictures. You will find that online consultants will not be able to help you with specific advice when it comes to selecting the breast implant type/size/profile necessary to achieve your desired aesthetic outcome.Generally speaking, the best online advice I can give to ladies who are considering revisionary breast augmentation surgery (regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully.  Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals  with your plastic surgeon. This communication will be critical in determining  breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as  “natural” or "D or DD cup” etc means different things to different people and therefore prove unhelpful.
 Also, as you know, cup size varies depending on   who makes the bra; therefore, discussing desired cup  size may also be inaccurate.   
3.  Once you feel you have communicated your goals clearly,  allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals.  Again, in my practice, this decision is usually made during surgery ( after the use of temporary intraoperative sizers).  Viewing the patient's chest wall in the upright and supine positions, with temporary sizes in place, help select  the best breast implant size/profile for the specific patient.
 Best wishes. 

The volume and size of implants do not have a standard cup size result. Each implant size would look different for each individual, as each has a different chest wall measurement. In this sense, it would be hard to advise what size would really be best for you. Your best course of action is to schedule an appointment with your surgeon and have an in-person examination. Usually, sizers would be very helpful in estimating the size of the breasts with a specific implant volume.