泉じゅん　淫れる！ (1983)

Keiko Tsukada (Jun Izumi) works as a secretary at a management consulting company. Keiko is taught the pleasures of lewd sex by her company president, Hiroaki Sakakibara. She depicts the world of lewd pleasure between a beautiful secretary and the company president, and their irresistible sexual journey with rich sensual depictions.