The Strawberry Farmer and the Dragon King

Jungkook is a Dragon King on the verge of destroying the Mortal Kingdom, but the human king agrees to form an alliance by marrying him off with his heir-except he deceives him by marrying him to his bastard son, Taehyung, instead.

Or

A story where an illegitimate son- even while hidden away in the outskirts of the Mortal Kingdom- was always meant to be a dragon king.

WARNING: this story has explicit sexual content, and only a little angst but not between Jungkook and Taehyung
Top: JK
Bottom: Tae