I've fucked a few grandmas and usually move without a condom.
It depends why I'm there. Like stopping by a bingo hall to use the bathroom? Probably similar to any shopping trip - there with a purpose, but slowed down with awareness of opportunities.
When you mention that, i get imAges of knocking grannies over like bowling pins
The other way it could go is multiple grandmas get turned on from the boob brushing
Lets consider the main difference between the two: destination arrival time. for example, multiple turned on grandmas blocking your way will definitely make you late late