FTP, name this book which is followed by Runaway Horses, The Temple of Dawn, and The Decay of the Angel as the first novel in Yukio Mishima's Sea of Fertility tetrology.
In this work, a character realizes that clouds change not while you gaze at them fixedly but when you look away, an idea which is reflected in the third line of Wang Wei's poem "The Cheng-nan Mountains."  That poem's title is also reflected in this work in the name of an estate where four youths spend the summer of 1912.  At one point, a young lover is smuggled to the beach, where Satoko makes love to the central character.  On that same beach, three moles on Kiyoaki's side are observed by a student of German law, Shigekuni Honda, who would be haunted by those specks in later works.  Kiyoaki dies at the age of nineteen after Satoko locks herself in a monastery after aborting their love child and breaking off the engagement to the emperor's son.  FTP, name this book which is followed by Runaway Horses, The Temple of Dawn, and The Decay of the Angel as the first novel in Yukio Mishima's Sea of Fertility tetrology.
In this work, a character realizes that clouds change not while you gaze at them fixedly but when you look away, an idea which is reflected in the third line of Wang Wei's poem "The Cheng-nan Mountains."  
Spring Snow or Haru no yuki (prompt on Sea of Fertility or Hojo no umi)