My father's new wife, Rei, came to our house. My stepbrother Makoto, who is around the same age as me, suspects that she might be after money. When I secretly peeked into Rei's bedroom, I saw her masturbating... Learning about Rei's sexual frustration, Makoto starts to corner her whenever my father is away. He makes her wear embarrassing outfits and stirs up her shame, gradually training her into a lewd woman...
