OKD-012 - Forbidden love with my son, Yumi's obsession

Yumi's youngest son, Showa, is the apple of her eye, born 10 years after her first two children. Their bond is unusually tight, often seen holding hands in public. With the father away on a long business trip, the mother and her teenage son cross the line, becoming lovers. Now, neither wants anyone else, and Yumi is determined to keep her son all to herself forever.