That stepmother has a past. ~Unknown beautiful stepmother slave training~

"Your father's new wife is also known for being a super beautiful woman, right?" Kazuya visited his friend Kohei's house to find out the truth behind the rumors. "Hey hey, seriously, that person is your mother!? To be honest, I'm jealous." Kazuya can't hide his jealousy at his greater beauty and kindness than he had imagined. However, a few hours later, he never dreamed that he would end up humiliating and violating the beauty's body at will...