 If you liked
Ookami Shoujo to Kuro Ouji
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 ...then you might like
Kanojo ga Koushaku-tei ni Itta Riyuu
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In both stories, the girl enters a relationship with an ikemen, starting from pretending to be in one. However, in both stories, the girl takes advantage of the ikemen, and as a result, the guy treats her like a pet. The ikemen falls in love with the protagonist in a convenient manner, and although both stories have a similar vibe, it is the "black prince" who actually treats his girlfriend like a pet. Despite initially acting like jerks, both ikemen eventually soften their hearts for the girl.