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.
I'd get my ass in that one, too! After all, a Japanese couple records their sex for a reason, but for their friends. So they can cum on his wife too.