"Ran" is a bit of a mouthful. She was showing signs of attention to her stepson from the very first seconds of the video. Generally speaking, stepmothers are the easiest to divorce, they don't mind jumping on a younger guy's dick themselves, while living with his father (a richer man).
Now that's really powerful young fucking! It feels like the guy was holding back for a few weeks or a month to fuck the girl in the cunt and pour a liter of cum in it!