 If you liked
Kaibutsu Oujo
|
 ...then you might like
Immortal Regis
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Both have immortal boy toys serving some sort of Supernatural Mistress.
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Recommended by FlyingRamen
Their plots are pretty similar and so are the relationships between the two main characters.
If you were offer a second chance to live, would you take it?
IR and PR revolves around that, where the person granted a second life [immortality/undead] has to constantly drink blood of his/her master in order to stay alive. And have to obey the orders given to them.
They are drag into a world of monsters.