 If you liked
Sabaku no Harem
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 ...then you might like
Hoshifuru Oukoku no Nina
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The stories don't hold many similarities, but their beginnings are the same: a poor girl is captured (or bought) by the prince of her country, and ends up being close to him (in Harem in the Dessert the heroine is part of the prince's harem, and in Nina The Starry Bride she takes the place of the dead princess). The girls' personalities are also quite similar, both being strong-willed, straight-forward, childish (one of them is 15 years old I think so makes sense), and devoted to their beliefs/loved ones. The princes themselves resemble each other a bit.