Kyouran Ketsuzoku

Miwa is a plain office worker, but she wins the heart of Shinya, the son of an old, distinguished family, and they are to get married! She's reached a happy goal...or so she believes briefly, but on her wedding night, she's dressed in a black wedding dress and presented to a man she's never seen before...! It seems the man is Shinya's twin brother, Koya. "The man who gets you pregnant will be your true husband. Conceive my child...!" Heavy-handed caresses, relentless rubbing of her chest, her feelings "down there"...! When the cool, handsome butler joins in, Miwa's newlywed life at the mercy of three men begins...!

from Renta!