The main character “Kazuya” bought a personal computer without telling his mother.
The woman who appears on an adult site on the Internet that I found suddenly was two with her mother, although she had a glance
… Kazuya.
He gradually gets excited about the woman, who resembles her mother, who is being trained by a middle-aged man called her owner on the site.
Then, the over-the-top disclosure of SM acts finally raised the suspicion that her mother was “no way” and swelled.