Jack's expectation of the assault was the only thing that kept him from crying out, the pain at Ennis grabbing him enough to make his vision blur. Still, he didn't fight it, letting his lover take him how he needed. He was too injured to have much input in what was happening, but he knew it needed to happen. For both of them.
Pressing his face into the wood, he closed his eyes and focused on the feeling, biding his time until Ennis exhausted whatever it was had taken over him.