My mom lets you have sex, your mom lets me have sex. Immoral neighbor, incestuous mother-son swapping and incestuous relationship. Igarashi Shinobu, Shiomi Yuriko. DTKM-029

The story of the two mothers and sons: The adopted brother was staying at his house because his house was being renovated, but he couldn't forget his desire for his mother and had sex with her several times. After seeing this, the younger brother discussed with him whether he wanted to come and exchange mothers for sex...