This is how it's done. The guy fucking has a beautiful cock and he uses it perfectly. He fucks his cocksucker's throat in a regular rhythm, making full balls deep penetration, but backing out just enough to let his partner get a quick breath when he needs it. This way he can fuck that throat for long stretches of time, hopefully until he shoots. And as a cocksucker who loves having his throat fucked thoroughly, I'd take this cock as long as is needed.
What a perfect video....it should be the blueprint for deeply satisfying throat fucking for both parties. Slow and steady penetration in an obviously skilled and trusting sub...thanks!