Pride of Duty by Andrea K. Stein

Willa Morton leads a life fraught with secrets.
She’s lived the last ten years of her life as “Wills,” physician’s assistant to her Royal Navy surgeon father. Their subterfuge works well until he collapses and dies from a heart attack. Her days as a woman living free as a man are numbered.

When his father’s political clout lands him on a ship of the line, Dr. Cullen MacCloud resents his latest posting, away from his friends on the African Squadron and the dangerous work they do. Will, the deceased surgeon’s son, is a sullen sprout, but Cullen’s stuck with him. Since the posting is temporary, what could go wrong?

What if these two have more in common than they think? Will a thin blanket hung across the middle of a tiny cabin be enough to protect against the desire smoldering between them?