Gajja Yeodongsaengeul Wonhamyeon

Fitting in with your family has never been harder.
To escape her brothel, Grizz Benedict is offered a fake identity as the Virenhague family's daughter. Her new "brother" showers her with gifts, and soon he attempts to give himself to her entirely. Despite feeling that this will all end in disaster, Grizz wonders if she ought to just accept it...
(Source: Manta)