Little Doctor, Big Daddy (The Lactin Brotherhood #5)
Alex Blaine

Mack Porter visits Dr. Billings with a situation he can no longer keep to himself. He’s managed to hide his lactation disorder for his whole life, but now, the condition that was the result of unethical experimentation when he was a child has started to affect his life in significant ways.
He can’t be the dominant lover he wants to be while constantly worrying about what his partners will think.
Dr. Billings is an expert in these matters and the only person who can truly help him.
Little Doctor, Big Daddy is part of The Lactin Brotherhood shared world about men who naturally lactate and the guys who need them. This is the third DD/lb lactation kink solo book by Alex Blaine with other authors also writing and co-writing in this universe. If you're interested in writing a Lactin Brotherhood book of your own, please reach out to any of the authors for information.