DNJR-021 - My niece wants me to drink her pee? The hidden madness behind her innocent face

The protagonist, a jobless loser with no girlfriend, has his shameful fetish discovered by his niece, Kotone. While she acts like an innocent, sweet girl in front of her mother, she turns into a sadistic queen whenever they're alone. 'Uncle, nobody needs you, right? Let me make you useful. Of course, as my pet dog...'