The Demon Lord’s Bride (BL)

Getting transmigrated into a novel isn't really so bad—you know the plot, you can foresee future events, and you're privy to all the hidden secrets. You could potentially become the most powerful and omniscient being in that world. That is, unless you wake up during the epilogue. Now, I find myself inhabiting the body of a fallen priest at the end of the story. A tragic hero who had his mana circuit shattered in the final war, now ostracized, drowning in debt, and destined to die soon. Fortunately, I know just the cure. Unfortunately, the cure lies in the hands of one of the Demon Lords—the very race my kingdom was at war with. Would he give me the cure if I asked nicely? There's no harm in trying, right? Without it, I would die anyway. "Sure, but you have to be my bride as the price," the Demon Lord said. ...Excuse me? Sir, you do realize I’m (technically) a priest, right?