 If you liked
Kuroshitsuji
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 ...then you might like
No.99: Ningen Omocha
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'No. 99..' as well as 'Kuroshitsuji' tells about the young earl and his loyal butler. One difference is that in the first manga, butler is elder man (something like Tanaka in 'Kuro'). But the both lords are very similar-looking and pretty spoiled.
Besides, 'Ningen Omocha' is yaoi, and 'Kuroshitsuji' is authorship of yaoi mangaka.