Suki no Onshoku wa Kikanaide

Yuuki, a music student, has a crush on Takeshi, a piano prodigy who is 10 years older than him. Yuuki has been crazy about the tone of Takeshi's piano since the first time he heard him play, but he has kept his feelings hidden ever since he realized that it is love. One day, a simple remark leads Yuuki to go live with Takeshi at his house in Vienna! Takeshi says he can't refuse Yuuki's request. So when Yuuki gets drunk one night, he ends up begging Takeshi to kiss him...?

(Source: Daria, translated)