Luke's Present by Sue Brown

Lost Cow Ranch foreman Simon Bryan is worried about Luke, his boss and possessive partner of twelve years. Reeling from the flood that took his horse, Luke has postponed surgery on his knee, and his nightmares have been escalating. Worse, he is pulling away from Simon emotionally. Desperate to help his lover cope, Simon plans a special Christmas gift, but it is Luke's present that changes their relationship forever.