5’10/178cm & 135lbs/61kg - do I have enough fat for fat transfer to breasts? (Photos)

Because he has very little excess fat you do not have enough fat for large volume fat grafting to the breast. You may have enough fat for a small amount to be placed in the proper areas in combination with augmentation, but this would depend on your desired appearance. The formal and person examination would be best to give a definitive answer.

3/4 cup size increase is about average for one fat transfer procedure. The fat transfer volumes to each breast may range from 240 cc to 360 cc in most cases. About 50% of the fat survives, on average.
Thinner patients are outstanding candidates in my opinion, because the fat transferred is extremely resistant. Results are largely dependent upon the skill of the surgeon, his/her ability to remove fat without creating contour deformities, and your expectations.

Harvesting the fat in someone as thin as you risks dents in the skin. Most of the fat will not stay anyway. Don’t want silicone gel? Consider saline