"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).
If a girl puts on black underwear, it means she would like to be groped by a black man. And that's what happened. What's she gonna do after that? Suck her dick and spread her legs. And the negro is happy to stick his dick in her pussy and make her drip. He got her good and tight!