I talked to him about this scene, and he remembers it clearly. He said that sometimes things click and her pussy just felt so good. In addition, she gave him a little attitude, which turned him on even more, so he decided to fuck her harder.
He thought the studio would stop him or take a break, or cut this out of the final vid because it's too rough, but they didn't. Shane told me the aggression and anger you see on his face is real, and at that moment, he really did want to ruin her cunt.
I praised him and told him that I WANTED him to ruin her.