Want 2500 cc in each butt cheek - can I suggest that amount to my surgeon or I have to go smaller? (photos)

There is a skin component to consider as well as the amount of fat available.  5000 cc of fat volumetrically is likely more than is represented in the photos.

The question of whether a patient has "enough fat" is relative to their goals and expectations. Most patients have adequate fat for transfer, however, adequate for transfer does not necessarily guarantee a particular result. There must be some correlation between expectations and reality in order to ultimately obtain a satisfactory outcome. 
"BBL" or buttock augmentation is an excellent option for contouring the hip and buttocks area. However, there are limits to what can be accomplished. The primary limits are:
-donor sites available for fat transfer
-patient anatomy
Patients often forget that their shape is defined by more than mere fat content. Bone and muscle structure also plays a critical role in defining shape. While fat transfer can add to these contours, it cannot create them de novo. Patients with narrow hips will be hard pressed to achieve a dramatic contrast in waist to hip ratio.
It is also important to remember that not all of the grafted fat remains (up to 50% resorption rate). Thus more fat will need to be harvested and processed than can be reasonably expected to survive long term. I usually tell patients that for a moderate volume change they should expect at least a 500 cc per cheek augmentation (assuming 50% resorption this leaves a 250 cc augmentation). In order to achieve this minimum, patients must have 1000 cc for harvest after processing (some is lost in the process). Less than this can potentially lead to a result so subtle it is difficult to appreciate.
Based upon your photos, you appear to be a reasonable candidate for transfer. However, your goal of 2500 cc of fat per cheek is highly unrealistic. This volume would imply that after processing you had 5 liters of available fat for transfer. This is the limit of what can safely be harvested in an office setting and does not take into account the inevitable losses that come with preparing the fat for transfer. Even if you were somehow able to obtain 5 liters of graftable fat, it is unlikely that the recipient site could handle this volume.It also important to remember the grafted volume does not matter so much as the percentage of graft take or viability.As always, discuss your concerns with a board certified plastic surgeon (ABPS).

you can suggest what ever you like but I don't think your buttocks will take that much fat at one time. What is most important for the final outcome is not how much goes in but how much survives the transfer. If I cram to much fat in that space then less will survive. Be clear on your goals but then be willing to realistic with what is possible. Good luck

John S Mancoll,MD