A Family Come True (Harlequin Super Romance Book 1989)

It started with a kiss… 

Ian North is the one person Darcy Maguire can always count on. So when her daughter's biological father shows up unannounced, she knows Ian will do whatever it takes to help. A kiss, however, is the last thing she expects. 

Suddenly their little white lie is out of control. They're spending Father's Day with Ian's family and lying about being a couple. Only pretending isn't enough for Darcy anymore. Ian is the best father her daughter could have, and she's ready to make it official. But how can she know for certain where the lie ends and reality begins?