I Become the Dog in an All Female Household

Yuuki Shimazaki finds himself in the care of an all female household after his parents die.
They all seemed so kind at first, but something perversely changes.

He can't help but lust for them.
Their hot bodies, their beautiful legs and arms, hair, clothes, even their excretions.
Pride lost, he can only find excitement in the different in level between himself and them.
No matter how hard he works, no matter how much money he has, it won't measure up.

At this point, the only thing for a man to do, is be turned into the dog they are.

And so the naive Yuuki was toyed with by these girls who see his true nature.

[From DLsite English]