Yosuke returns home late after his overseas trip with friends is suddenly canceled due to bad weather at their destination. When I opened the front door feeling depressed, I heard a conversation between a man and a woman with no one else in my house, where only my mother was supposed to be. ``...Ma'am.'' ``Your cock was big and nice...I think I'll ask you to personally deliver a big dick again.'' What Yosuke saw there was his mother seducing a young man who was a delivery boy. Yousuke is shocked to see his mother's lewd appearance, exposing a woman he has never seen or heard of before, and is unable to make a sound, and ends up standing there and witnessing the whole thing...