 If you liked
Under (xGround) Grand Hotel
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 ...then you might like
Hoshi no Yakata
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Both are very explicit and graphic and contain a lot of smut, yet still maintain a set of extraordinary characters, a fabulous plot, and is super enjoyable to the max. Also, they're both really really hot.
As a warning, both are quite hardcore in the sense that UGH contains quite a bit of rape and Hoshi no Yakata centers around S and M, BUT please don't be turned off by them because of those sole reasons because it would really be a shame if you missed out on reading them. Despite all the sex and dark stuff, they're both truly incredible reads.