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.
Well no wonder in principle he fucked her, she was going for it, she did not drink for nothing, let's say for courage, and the black guy immediately put his big cock in her pussy, and she was happy.