Isoji obasan: Sukebeettarashii shiri

Original title: 五十路おばさん 助平ったらしい尻

Mitsuko Uesugi is a building cleaner who wiggles her massive buttocks while she works. Kazuya Yoshioka, a butt-obsessed employee at the company, becomes captivated by Mitsuko’s rear, finding himself constantly aroused whenever he sees it.