GBSA-001 Secret hot spring of depravity I will become the sex slave of a man who isn't you...

"Why did a sensible married woman become her husband's male friend's sex slave?" A wife with cuckold fantasies is asked by her husband to 'travel with a male friend.' Leaving home under the condition of '[just] traveling,' she can't gauge her husband's true intentions and looks gloomy throughout. She panics when faced with an erect penis in the mixed bath, but ultimately gives in as she's pushed down onto the floor. Her pitiful figure apologizing to her husband while being penetrated by another man is touching, but fluid leaks from her sex. Her reason crumbles as she experiences bondage and threesomes for the first time.