The Bull Rider's Son (Harlequin American Romance Series #1554)

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Cassidy Beckett has a secret she's kept for six years: the identity of her son's father. She can't hide the truth much longer. The Easy Money Arena's new bull manager, Shane Westcott, also happens to be the boy's handsome uncle. But Cassidy will do anything to protect her young son, even if it means steeling her heart against Shane's nearly irresistible charm. 

It doesn't take Shane long to figure out two things—Cassidy's son is his nephew, and his feelings for the boy's beautiful mother go way beyond friendship. As a single dad, Shane knows how important a father is to a child. He also knows the men in Cassidy's life have let her down before. Can Shane convince Cassidy to face the truth without losing her trust…or his heart?