After a battle with the pope left them both gravely wounded, the progenitor of vampires fell into another world.
Then someone found him.
And then he was added to the harem.
The young king was handsome, powerful, and, most importantly, in pursuit of immortality.
The vampire figured this was right up his alley.
Only later did he learn that the young emperor had been poisoned on his way to the throne and had little time left to live. He also didn't want children who might threaten his position, so he went crazy and started taking men as consorts to use as shields.
The vampire didn't care. He'd leave once his wounds had healed.
But there were too many schemes in the imperial palace, and he fell into one before he knew it.
A scheming courtier drugged the young emperor.
The young emperor turned around and gave the vampire a cup of wine laced with an aphrodisiac.
The vampire, who couldn't die and didn't care about poison, took the cup and drained it.
In a haze... he slept with the young emperor.
When he came to,
the vampire saw the young emperor, disheveled and murderously furious, holding a knife to his throat.
Well, um... was he supposed to take responsibility?
An emperor bottom with all the traits of a scumbag top vs. a vampire top with an excellent attitude and, most importantly, a tough-as-nails constitution.
Theme: Accept your flaws and work to become better