Si ya recibió un conjunto de ropa interior de IA, entonces no hay nada más que hacer allí. Ni en la versión estable ni en la versión beta.
This character is available in version 0.70, which is currently in the beta branch. It is usually activated after the game asks a question.
If you are using a very raw version 0.70.001 obtained from a third-party site, wait for a newer build or until version 0.70 becomes stable and is published here.
And yes, Spanish is available in the game settings (the first beta builds have new scenes in English).