Keep Me by Sara Cate from The Bookish Box and Shop

All Killian Barclay wants is to be left the hell alone. He's had enough heartache to last a lifetime, and he has no more need for love- earning him the reputation of a broody Scot and eventually turning his famous ancestral home into a den of iniquity. It doesn't take long for tales of his raunchy house parties to reach the rest of his family, though, inspiring them to hatch a plan to shake Killian out of his routine.
New Yorker Sylvie Devereaux is tough as nails— as the daughter of famous yet neglectful parents, she's grown a hard shell and keeps everyone at arm's length. So when she sneaks into Barclay Manor during a trip to Scotland to get a glimpse of a famous heirloom, she doesn't anticipate facing off against the brutish, maddening Highlander who lives there. And she certainly didn't expect to ever see the bastard again.
Yet just weeks later, she's approached by Killian's family with a proposal —move to Scotland and marry Killian to improve his playboy reputation, and after one y