In fact, it's a proven fact. No one would refuse such a training session on boxing, see how she was furiously sucking his big dick, and she seems to be enjoying it as well. In general I think that such a fuck will be a norm for them now, because they are unlikely to stop at the received emotions, they will want more and more, and there more and more, we just have to watch.
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).