Forever Mine by Robin Shaw

While most of Felix Sanov’s friends taste in women changed frequently, Heidi Dowle, the older sister of his best friend, Nataeus, was the only woman he ever wanted. At thirteen years of age, Felix’s relationship with twenty-year old Heidi had been innocent. She’d helped him when no one else could. When Felix became an adult, he knew that Heidi would be his woman. It was just a matter of when it would happen.

For as long as Heidi had known Felix, she was unaware that she was the only woman he dreamed about. She’d seen what most people hadn’t seen in him; he was smart and capable of doing great things in his life. And so she had helped him. She hadn’t expected Felix to be in her corner during her time of great need. At a better place in her life now, Heidi thinks she should leave Felix alone so he can find a woman and start a family.

But Heidi doesn’t know that Felix has the final say about that and she has always been the woman for him. And he has always been the man for her.