Selfish Love(2001)

Kunshu-sama no Koi wa Katte!

Ryuya was only trying to finish his University courses when he caught the eye of the wealthy and gorgeous Orito. As President of the prestigious Honors Society, Orito has the right to hand-pick his assistant...and he's chosen Ryuya! Campus politics aren't the only things on Orito's mind, and Ryuya is shocked to discover that his newfound suitor always gets what he wants.

(Source: SuBLime)