Swapping no Wana ~Netorare Mitsugi Mazo-ka Keikaku ni Ochita Boku~

A husband's relationship with his loving wife takes a drastic turn when they agree to engage in partner swapping with their neighbors. The husband is quickly manipulated into a submissive role while his wife enjoys the company of the muscular neighbor husband. Subjected to extreme humiliation and cuckolding, the protagonist is forced into a chastity device and made to submissively watch or participate as the others physically dominate him. Ultimately, he falls victim to financial exploitation and is forced to watch his wife have sex with the neighbor while the neighbor's wife degrades him with her feet.