ブッキーが中破してもブッキーしてないので心配になりチェックする妹たち。
磯波が一番大人っぽいのをはいてて「え？まだアレなの？」とか思ってそう。(個人の見解)

Little sisters who are worried that mid-damaged Bukki isn't Bukki. Isonami will be thinking "Huh? Still with those?" as she's wearing the most adult-like pair of panties. (Personal opinion)