Barun barun shiyoru! <tn>Based on the Nico wiki article <a href="http://dic.nicovideo.jp/a/%E3%81%B0%E3%82%8B%E3%82%93%E3%81%B0%E3%82%8B%E3%82%93%E3%81%97%E3%82%88%E3%82%8B!!">here</a>, this is a saying normally associated with Shijou Takane's breasts. It's a derivative of "burun burun shiyoru" (ぶるんぶるんしよる). According to the Nico wiki <a href="http://dic.nicovideo.jp/a/%E3%81%B0%E3%82%8B%E3%82%93%E3%81%B0%E3%82%8B%E3%82%93%E3%81%97%E3%82%88%E3%82%8B!!">here</a>, "burun burun shiyoru" was a phrase that was originally used by the uploader of the Hagiwara Yukiho video <a href="http://www.nicovideo.jp/watch/sm4030777">here</a>. </tn>