The inappropriate relationship between a biological mother and her son

Yuka has been remarried for a few years and is living happily with her new partner. The only issue is that she is still having a sexual relationship with her own biological son! This inappropriate relationship started long before Yuka remarried. She thought that remarrying would be an opportunity to end this relationship, but clearly Yuka cannot refuse her son.

She also realizes the extent of her feelings for her eldest son. And when her husband goes on a business trip for about three days, the two of them throw caution to the wind, dive into each other, and enjoy this fleeting private happiness together...