Nice couple and they had a good time. Oral caressing in the 69 position is a real hoot. As for me - it is possible to stop here. You don't have to do sexual acrobatics every time. Quite a normal way for two to enjoy sex. But more often in this option, the first to cum is a woman. So then in any comfortable position, you catch up with yourself. It is best to lie on your side - when you come you can leave your dick in the car and lie there for a while more relaxing and stretching your pleasure of having a woman.
I think the guy is far from a pioneer, the girlfriend is very confident in the anus! It feels like a lot of experience and regular practice. He's probably happy that he got into a well-developed anus, and he doesn't have to talk his girlfriend into it!