Forever the Highlands by Samantha Young

He’s her brother’s best friend. She’s totally off-limits. But when life takes an unexpected turn, she’s the only one he wants at his side…

Fyfe Moray raised himself. His only real family is his best friend, Lewis Adair. For that reason, Lewis’s sister Eilidh is totally off-limits. Fyfe is in deep denial about their intense attraction. Thankfully, Eilidh is a famous actor living in London while he runs his cyber security company from the Highlands. They’re worlds apart. Until one day, Eilidh reaches out asking for a lifeline and Fyfe can’t bring himself to turn her away.
Acting isn’t what Eilidh Adair expected. As a kid, she wanted to be just like her famous uncles. But the double-edged sword of fame cuts deeper than expected. Afraid to admit she’s made a mistake, Eilidh is spiraling. The only person who knows the truth is Fyfe, but her childhood crush has developed into a love he won’t return. Yet when she comes home intent on starting over, Fyfe can’t seem to stay away. His confused feelings might just be the end of them. Until a woman from Fyfe’s past abandons the baby daughter he never knew he had.
Now a single father, Fyfe needs support. He just never expected Eilidh to be the one he needed most. Fyfe can’t believe how quickly he falls for his child and how rapidly his world view changes. He’s ready to admit the truth: he’s madly in love with his best friend’s sister. And Fyfe’s done wasting time.
But someone else believes Eilidh belongs to them. Someone who has been watching her far longer than she realizes. Just when she thinks she might have everything she wants, Eilidh finds herself caught in the crosshairs of a person intent on destroying everything she holds dear.