Pete can't move, but that isn't really the important part. That makes sense. How would he move, when every part of him that might try is sheathed in warm, slick flesh? He's trapped in the mouth of the beast. What's important is -
Edmund, watching intently, stroking himself so fast he's shaking. Peter, pressed up behind him, grinding into his back. Tintin, fingering himself and licking the juices from his fingers. Hywel, laughing and gyrating and swinging his cock like a bat.
And Tom. Tom, looking at him. Tom, riling up the other boys. Tom, stroking his skin and licking his cock and putting his face so close to Pete's that Pete can smell his toothpaste. (Not mint - it's hard to describe what it smells like, especially while he's asleep.)