this is part of the latest lumination fest, i think. its an arranged marriage au and very sweet ;; its very well written too.. i adore the author's way of story telling

Title: Duty over Pride by thesockmonster

Status: oneshot

Rating: NC-17 for the mild .. but its not too imo

Warning: none?

Summary: To secure peace, Minseok is sent into the heart of his enemies to marry their Prince.

Link: http://archiveofourown.org/works/7079944?view_adult=true