Negroes, mulattoes like to spank white girls in all holes. The fact that this brunette is also a charming girl - gives a glamour to what is going on. And he's just using her as a device to jerk off his dick and lick his balls. He uses it and then he flushes it. And she's satisfied.
Actually, it makes sense. Asian girls have small pussies, so they make up for it with their mouths. The blow job was really deep, and she was good at it, even taking it in her mouth completely.