Chiisana Hoshi no Oujisama wo

Grandeur, the exclusive second prince of a small country, attends a party hosted by an Arabic man, Minshea Bark, acting as a diplomat. Not long after, Grandeur finds out the real purpose of the party... The party is an auction, and the item to be auctioned is actually Grandeur himself! Also, the person who wins the auction, Minshea, takes Grandeur's body by force...?

(Source: Taiyo Tosho, translated)