The hand in his hair makes him intuitively want to turn to ask what Anders is doing - which is in and of itself a sign of trust, if he'd had any hesitation he'd have been reaching mentally and predicting - but is stopped by the hand on his back.

He doesn't have time to get too confused before the low voice is in his ear and tension abruptly, completely, entirely, just drains out of him. Why? Because it's clear instruction, boundaries, rules, and that was maybe a little of what he wanted in handing over the collar-

It's also an extension of the dance.

"Yes, sir." His tone is slightly bratty and teasing all the same, but he hears, he understands and god this whole thing is both hot and relieving. Thank you