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.
The girl just splashes sexual energy - from such a well every traveler would like to drink. And to fuck her while doing kamasutra is a pleasure for a guy.