It is a bad sign. Miles usually isn't this hands-on when they're sucking him off. Servicing him can take up the entire day sometimes, when they've done a good job with their chores and their Alpha wants to just sit by the fire and rest. Even then, he only touches them or engages with them at all when he's close to release.

But now, he's playing with their hair, easing it back, away from their face. He's talking to them, making demands. It's enough to make alarm bells go off in Kurt's mind. They gaze up at him, eyes haunted and sunken after almost a month of this, searching his face for any sign of what's about to happen to them. Searching for that glint he gets in his eye, that telltale twitch at the corner of his mouth.

Despite the sudden dread settling in the pit of their stomach like an iron weight, Kurt does what they're told, their shaky hands going behind their back, fingers grasping their own wrists to keep them steady. The whole time, they don't stop bobbing their head, pushing through the pain, lips pursing around his cock, kissing the swell of his knot on every descent. They feel him twitching against their tongue, which they pulse against his hot flesh in return, exactly the way he likes it.

Anything not to give him a reason.