Videos like this always trigger memories of my youth sucking cock in my car before I had a place of my own. I was always careful to swallow all the cum so there was no mess on the car seat. I sucked off a lot of men in that car!
My guess is they still live at home and aren't even remotely dating a female. It's how it usually works, you find a motivated, horny guy who wants to have bisex with you but neither of you can host.