A Shock Collar

You reach into the bag and pull out a strange-looking collar.

"A dog collar?" You say, perplexed. "You want me to wear this?"
"That, and nothing else." Joy replies.
"Oh, and it's not just a collar, it's a shock collar." Natalie says, gleefully. "And we have the remote-control."
"No, this is crazy. I'm not wearing this." You say, firmly.
"Then you're not getting a release." Sara replies, matter-of-factly.
"You want me to walk around and serve your friends wearing just this shock collar, and my chastity device?" You question, a note of pleading in your voice, as if you're hoping it's a joke.
"Yep." Replies Joy. "Of course, we can't actually make you do it. You're free to do whatever you want; just as we're free to keep your dick locked away forever and never give you a release." You stare daggers at Joy. This is absurd, you can't believe you're actually entertaining this notion. At that moment, Jiun yawns, stretching and briefly exposing her midriff. Your dick grows swollen and very uncomfortable in its tube. You think about what you're doing this for; a weekend free from chastity. You could get your dick wet for the first time in months.
"Fine." You grumble, "I'll wear it."
Jiun chuckles. "You must be so **** and horny if you're willing to do this for release. Come here, I'll fix it around your neck." You kneel down as Jiun deftly attaches the collar around your neck and locks it at the back. She places a couple of fingers down between your neck and the collar to make sure it's not too tight.

You catch a glimpse of your naked, kneeling form in reflection of the sliding glass door, and wonder, not for the first time, how did it come to this? How did you wind up here? Honestly, at any point, you probably could have overpowered the girls and taken your key back and unlocked yourself, but the truth is, you didn't want to. Deep down, you like the power they have over you. You like it.
You like it, and you can never admit it.