Marrying the Mistress — Juliet Landon

Guardian…and husband
Helene Follet hasn't had close contact with Lord Burl Winterson since she chose to spend her life caring for his brother. Now she's forced to live under Burl's protection, because he has become guardian to her precious young son.
Burl has grown hard and cynical over the years,
while Helene covers her hurt with an ice-cool front. What she really craves is to finally find a loving home in his safe, strong arms. Neither can admit that they are still tantalised by the memory of one magical, fateful night…