The Jerk by V. K. Ludwig

Love never comes without consequences; not matter what was agreed upon.

160 years in the future, a wife to start a family is a rare find. Only the best clansmen get to have one, and Adair knows he isn’t making the mark.
When chieftain Rowan assigns him as Ruth’s guard, all he wants is prove his worth and keep her safe. But it doesn’t take Adair long to figure out that Ruth doesn’t want to be kept safe — not from him, and certainly not from herself.
Ruth wants to experience the physical bond between a man and a woman; something that could cost Adair his life if he gave it… and his sanity if he didn’t.
When emotions get in the way, Adair and Ruth realize that even an encounter with “no strings attached”, doesn’t mean it comes without consequences.