My husband doesn't wake up when he sleeps... ~A married woman captivated by the thrill~

Reiko was bored with her fulfilled life. Although she loved her husband, she had no relationship with him, and Reiko sought physical fulfillment from her young mistress, Osawa. When her husband goes out, he brings Osawa to his home and spends all his time having sex with her. However, even every day like that was not enough for Reiko. Reiko then calls her husband while being held by Osawa and gets pleasure from the thrill. Reiko's desire escalates further, and she finally begins to let Osawa live in her home and even bring her into the bedroom where her husband sleeps...