I can say that the stranger behaved with the brunette on the bus as if they had known each other for a long time. He laid around flatteredly while the girl was sucking his dick, and they fucked each other without any shyness. The damsel took a ride not only on the bus, but also felt the powerful bumps in her hole from the guy's stick.
A girl in glasses makes many people sexually aroused, there's something about it. And here, on top of everything else, she's also pretty and shapely, so the guy successfully hooked her up.