Creampie incest mother raped by son

Yuuna, a mother who raised her son Koichi strictly from an early age in order to send him to a national university. If his grades dropped even a little, he would scold him with piercing words and force him to spend his days immersed in studying. Before he knew it, Koichi began to feel anger and hatred toward his mother, and devised a plan. When my father was away on a business trip, he tied up my mother and raped her...