She puts it on herself

She decides that you deserve a little reward and that middling the belt and giving you a show would be a great idea. She still indeed loves you and feels like you been so loving and loyal. You wouldn't just turn on her, right?

She gets up off the couch and turns off the TV as she grabs your bottom lip. "Well, you have been a very good girl. I guess I could, but just this once and I want to appreciate this to the fullest. Not many Mistresses would do this for their slaves. You understand Sweetie?" You reply with a bit of relief in your voice "Yes my Mistress."

After this, she struts to the front of the couch and moves the coffee table as she slowly slips off her white button-up shirt and long black skirt, watching to make sure you're taking in the show to the fullest extent, and you are. She strikes a few seductive poses and squeezes her breasts as your right hand has worked its way under your skirt and is fingering your pussy raw. She finally gets them off and moves on to the belt. The controller was right next to you in the bag on the couch and you could easily grab it once she got the belt on. She worked the belt up her legs and around her ads and crotch. She pulled the leather strap so it wouldn't fall down and clicked the small padlocks shut. Your fingers were going so deep, almost acting on their own as you let moans and groans of pleasure escape. The sight of her putting it on, sliding it up her slender legs and getting it nice and tight around her waist. You started to create a puddle on the couch as she took the main key into her hand. She pushed it in and turned it till the tumbler made a clear click. She set the key down on the coffee table and looked to her now soaking **** fingering herself to her Mistress locking up a chastity belt on herself. She had to admit, it was actually getting horny herself.

Then she felt... Something was wrong. Just as she got the belt on, heat started to build up in her crotch, her ass, and her tits and it was not stopping. She started to feel a bit frustrated with this and it started to feel like a growing itch she couldn't scratch. She slowly fell to her knees as the feeling only kept growing. She tried to massage her nipples and found it helpful to release the itching feeling. She tried to reach for her pussy but failed as the belt stopped her from doing anything to put out the itch. She tried to reach for the key, but the feeling had become so intense she fell over frantically trying to stop the maddening itch to no prevail. She is now on the floor gripping one of her chests as the other hand tries to get under the belt.

You watch this happen and find this to be just so satisfying. You haven't even touched the controller and she's already dropping to her knees. The question was, what now? You could start using her and test out the buttons. Maybe there's a setting to help you get off. Although, watching her squirm right know is just turning you on. Maybe you should just watch for a little longer.