Breasts aren't just fat. Large portions of the breasts also contain lobules ( milk producing glands ), milk ducts and fibrous or connective tissue.

I still like the drawing, I'm just really tired of seeing people who legit still think that breasts are just made up from fat.

"Fat." Her expression. Ha.

Mirko does seem the type to be in on showing off her toned bod. It's a sculpted work of art, needs to be appreciated.