 If you liked
Tokyo Babylon
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 ...then you might like
Caste Heaven
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While not as severe as most yaoi (it's technically shounen ai and even then, no actual kissing or genuine affection takes place), there is a lot of flirting and brutal pain to be had in this manga. The main character is Subaru who has a pure heart and cares deeply for everyone he meets while his pursuer is an Assassin who considers everyone else to be less than objects. I just think with how twisted the characters are (especially when it follows into X) and the darkness of the series contrasts well with Caste Heaven.