What is a short-summary of the story, The Sister, from the collection, No One Belongs Here More Than You?

In the story, The Sister, a man in his sixties attempts to go on a date with Blanca, the sister of a friend. However, he is repeatedly unable to contact her. Eventually, the friend reveals that he lied, and that there is no Blanca. The friend expresses romantic feelings for the man, and they become sexually intimate with each other.