This black guy is not only a winner in the ring, but also a winner in the genetic lottery. Compared to him, the white guy looks pale, frumpy, with no obvious muscle and no punch. No wonder the brunette took advantage of the moment while her boyfriend was out and fully committed herself to a black cock and a black life winner.
Considering the condition of the grandfather's device, I do not see anything surprising that the granddaughter let him clean her hole (I would even say, she begged to do it herself, apparently it itched a lot).