Aidan: Loyal Cowboy by Cathy McDavid

Aidan "Ace" Hart left Flynn McKinley heartbroken when he put family duty above her feelings. Then one night, the old passions were reignited and now Flynn is about to get something she's always wanted—a child to love.

Ace takes his responsibilities very seriously. Running Thunder Ranch and his busy veterinary practice leaves little time for a personal life. That'll only get worse now that he's spending every spare minute with Midnight, the champion rodeo stallion he hopes will save the ranch from financial disaster.

Flynn refuses to marry Ace and be yet one more "responsibility" to him. She wants Ace to want to marry her! And until he admits he loves her, she's determined to raise her baby alone….