Reverse NTR → A 3P quagmire in which even the wife is dragged in NHDTB-493

A woman who enjoys NTR (netorare, a sexual activity involving sexual intercourse) begins a reverse NTR with a married older man she fancys at a hot spring inn! Avoiding her wife's gaze, she secretly and lewdly teases him! The man, succumbing to temptation, engages in immoral sex! Even when his wife discovers him, he doesn't care and continues to engage in lesbian-like activities with her...