Does Sucking and Pressing the Breast Increase the Size?

The short answer is no. Only breast enhancement with an implant or fat transfer increases the size of the breast. The techniques you ask about may temporarily increase the size due to stimulation and swelling but this not guaranteed and certainly not lasting.

The short answer is no. Sucking or pressing the breast will not increase size in the long term. The major factors contributing to breast size are genetics, hormones, pregnancies, breast feeding, weight loss or gain and ageing.