ANIM.teamMM - Kabe no Mukou no Tsuma no Koe 2 ~Tonari de Hageshiku Koshi o Furu Asedaku no Tsuma wa, Zecchou no Hate ni Hakudakujiru o Sosogare Midara na Ikigao o Joushi ni Miseru~

The apartment where the protagonist and his wife live was caught on fire. So until they can find a new home, they will have to live with his boss' family for while.
Because they can't have sex in another person house, the protagonist is a little bit sexually frustrated. One day, his boss confesses that he has erectile dysfunction​ and asks him to sleep with his wife.

And thus, the swapping story begins.