Holy shit. I saw "dark" next to the "MurataxConrad" pairing and figured, okay, this is . Most everything labeled dark is just mildly violent or creepy. They'll probably just get rough, what with the big swordsman and the little boy pairing... but no. You went straight for the ultimate evil being reborn, ALL of Conrad's issues taking over and some nicely hinted at noncon, tort and probably violent death in the end. All in just a few hundred words. It's quite impressive.
In short, very few people do dark/dirty/bad Kyo Kara Maou properly cause it's such a lighthearted kiddy anime. You are one of those few. You have officially creeped out my early afternoon and have give my muses all kinds of bad ideas. I appreciate it. I really do. *bows* Great work.

Chilling. Absolutely chilling of a concept. :DD But thought out so well. Good horror fanfiction with a favorite pairing is hard to come by. Thank you for it. Honestly. Gah, I still have goosebumps!

~ Val