Ano Ko no Kawari ni Suki na Dake

Akio has not had sex with Reina for a month due to her pregnancy. Because of the lust accumulated for one month without being vented, Akio mistakenly thinks that his mother Reina is Reina when his mother tries to wear Reina's old clothes. After her mother Reina found out that her husband was dissatisfied because he couldn't have sex, she was ready to replace his son