The Marriage Scheme — Patricia K. Azeltine

Khara Thompson can't believe her luck: she inherited a house from her Aunt Beatrice only to discover the property line she shares with Adam Mansfield runs right through the middle of her house!
Little does she know that Aunt Beatrice and Adam's mother, Dolores, have their own plans for Khara and Adam: marriage! They knew Khara's house was built on the property line, so they schemed to bring the two together and then sat back to watch their matchmaking unfold.
Adam gives Khara an ultimatum: she can either let him move in temporarily while his new house is being built or she has to move her entire house. She has little choice and decides to let him move in.
From that moment on both of their worlds turn upside down and they find themselves attracted to each other. Can a man who's afraid of the M word and a woman whose career is her life really unite?