Help me find the title of a jav film related to chikan

[bimbofetish]

I remember a japanese adult film from the 2000's where a school girl enters a train or a bus and an older middle aged man does chikan on her(gropes her), she then looks at him and asks something like, “Why do men do chikan?” I want to know, so she keeps requesting him to answer that question, so he says that to know the answer she will have to come home with him, she agrees and over there he sucks her tits and fucks her, and says something like , “ I will show you my samurai cock” or something like that, don’t remember every bit. Please, help me figure out the name of this scene/film? I have been trying to find it for over 10 years!