[PFAS-032] Reiwa The Swap: Couple Swapping, Married Woman Sister Swapping Alliance (Censored)

Mafuyu, the younger sister, receives a suggestion from her sexually promiscuous older sister, Saki, about partner swapping. Her sister says that Mafuyu's frustration is showing on her face, and that the best way to resolve it is to swap partners. Indeed, as her sister points out, things aren't going well between Mafuyu and her husband. The reason is that her husband himself isn't feeling well. Though perplexed, she tells her husband about her sister's suggestion, and surprisingly he seems to think it's not a bad idea. Though she feels uneasy, Mafuyu decides to go along with her sister's suggestion...