The Professor's Golden Tiger by Yuki Edo
Shigure’s life has always been quite ordinary. He’s a professor living quietly and not expecting anything special to happen to him. All of that changes when two revelations come his way. His roommate’s very cute little brother, Takumi, has a crush on him. That’s intriguing enough, so Shigure is really thrown for a loop when he discovers both of them can transform into tigers.
Takumi is so excited when his longtime crush, Shigure, finally responds to him. But then the gorgeous older man discovers his family secret, and Takumi is afraid their love will end before it has begun. Will Shigure’s obvious desire for Takumi win out, or will he walk away because Takumi’s secret is too much to handle?