She lets him out

"Well that's your part of the deal. Might as well start with mine." The futa said as she let out a low groan. She knew that she was not fully obligated to let Vince out of chastity but at the same time...
"You earned it kid. Here yah go." She said as she fully removed her thick pale cock from his mouth and let it slap down on his face. Smacking down hard onto Vince's face as he felt his nose frying from the heavy musky scent of her futa cock. She went back to her desk as Vince slowly got up onto his legs. He swayed a bit as she returned with a small silver key as she gave him a small smile.
"Well this is it kid. You get out of your cage and if it all works out for you, me and you don't ever meet again."
"T-thank you."
"Don't mention it." She said as she bent down inserting the small key into the cage and with a small click! The cage came undone allowing his small brown dick to be freed from its prison as she sighed.
"In the future you should be a bit more careful with who you make a deal with you know?"
"W-what does that mean?"
"It means that not everyone is a long time worker with tenure like myself."
"What does that mean?"
"It means that some futas will not acknowledge what we did, they will not hold up their end of the deal. I almost considered not honoring it."
"W-why would you do that?"
"Because all futas love it when males squirm. The only reason that I have not gone back is that I have a future still ahead of me."
"Ahead of you?"
"That means that I need males like you to go off and tell this story to all of their friends. Let them know that I am a futa of my word. That means I get my dick sucked by a whole lot more males and I get to enjoy life a lot more. The younger futas might just let you stay locked but I know that long term benefits always beat short term gains."
"Um.. thank you? I suppose?"
"Your welcome. You may go now male." She said as she waved him away. Vince quickly left and found his mother Rochelle waiting for him on the outside. Her crimson eyes locked onto him as she rose an eyebrow.
"Did it go well?"
"Um... yeah it did." The door closed behind him as the two began to walk towards the meeting room.
"How did you get her to take it off?"
"I... um I did her a favor..."
"What kind of favor?"
"I... she said I could wait a month to get it off for free but..."
"But?"
"If I sucked her cock she would let me go right now... sorry if that was not what I should have done."
"It's ok. You made the smart choice."
"I did?"
"You did. Some males do not have the humility to swallow their pride to swallow a cock when it benefits them. You just lost a lot of suffering for just a bit of inconvenience. You made the right choice kid." His mom said smiling at him as she rubbed the top of his head as they walked back to their family and the car as Vince wondered what would happen now that he was finally able to go home and beat off.