Az didn't trust him so she cast 'Detect Magic' on the collar.  When she was convinced that it was harmless, she let him put it on her.  "You know you're going to owe me after this." she said.  "Owe me big time.  You know, like 'you can either do this or be castrated...your choice.'" she said to him, still overly pissed at what he did to her.  She still felt the urge to touch herself to relieve the tingling in her pussy, but was so afraid to as it was still way too sensitive.