OBA-225 Mother Madoka Sanki is raped by her son every night

Madoka's husband is away on a business trip. She lives with her two sons, Taichi and Yoichi. While her eldest son, Taichi, is a responsible man, her second son, Yoichi, has yet to decide on a career path, and Madoka is worried about him. One day, Madoka can't stand seeing Yoichi fiddling with his smartphone without listening to what others are saying, so she confiscates it... That night, Yoichi sneaks into Madoka's bedroom to get his phone back. There, he sees his mother's nighttime face, a woman, completely different from her daytime one...