looking for a manga

it was a bl story maybe yaoi or shounen ai i dont remember but the mc and other people were summoned into a dream every night. the dream was originally a fantasy story setting with a princess but it would change occasionally (i remember there was a city setting as well) but what remained the same were the people in the dream and they were on different sides. the mc was on the "bad guys" side and he and a guy on the "good guys" fall in love. eventually you find out that the dreams are created by the princess cause she's mad at her brother whos also in the dreams? but then her brother also gets the power to create the dreams and the power is given by alien cats??? well it was generally like that anyways...anybody know it?