Her Bossy Billionaire by Natalie Anderson

Having barely survived a business catastrophe, the last thing fiercely independent Libby Harris needs is her client’s bossy older brother interfering in her schedule. Especially not some far too good-looking, know-all billionaire.
Jack Barnes has been Mr Responsible for years, taking care of his vulnerable younger sibling, so when a random but gorgeous woman appears in his apartment claiming to be there for his brother, his wary radar pings.
Turns out the luscious Libby isn’t a threat to anyone but Jack’s own peace of mind and for once he’s tempted to cast off caution and indulge in the moment. But what should’ve been something light and funs turns sticky when other uncontrollable emotions emerge…