Neko to Mahou wa Kiss de Hodokeru

Lucas, an inferior student at a magic school suddenly had cat ears and tail! He's unable to block strong curses so he asks Dylan for help. Dylan, unlike his younger self, is now a cold and arrogant student council member who somehow still cares for Lucas, his childhood friend. "While investigating, I found out that the only way to solve this curse is... To have sex with a man!" And then Dylan said, "The curse, I'll remove it!"

(Source: Houbunsha, translated)