My girlfriend and I are off on a week long vacation to a foreign city. She's been locked in a chastity belt longer than normal, a record time for her, and is already climbing the walls in desperation. She's ecstatic about the prospect of an upcoming release in a romantic foreign destination.
We invite a close friend to travel with us, dark haired and petite. The friend knows about our kinky relationship, and has always been comfortable with it, if a little curious.
The question goes unasked, and the belt unmentioned for most of breakfast, until the friend finally asks. Her breath catches as my girlfriend explains over coffee that it's for her of course, if she wants it. The catch is that if she puts it on, it stays on for the entire trip, and I have control of the key.
We've never directly involved her like this before, and she's hesitant, but also has seen my girlfriend wear her belt for a year now, and has always been curious. My girlfriend’s belt didn't fit the friend, so trying it on was out of the question.
She's hesitant but curious, and curiosity gets the better of her. Moments later she's stripped naked and pulling the belt up around her waist, the shield between her legs. My girlfriend helps her get it right, but pauses just before the lock snaps shut, both looking each other in the eyes. My girlfriend whispers, "It's your choice. You have to be the one to lock it."
The friend gasps, nervous, worried and excited, holding the padlock. It's the last moment to back out, all is silent with anticipation and she hears the lock CLICK, loud, sharp and final. In holding it, she put just a little too much pressure, and it locked before she anticipated it. It strikes home in a flash. She's stuck now, wet with the knowledge that unyielding metal prevents her from doing anything about it, dread and excitement at the week ahead.
My girlfriend and I smile at her, get her clothes, and everything goes back to normal for the vacation as the friend gets used to the limitations of the belt.
The week is fantastic and goes by quickly. It's the last night of the vacation and we're all in bed, my girlfriend is begging to be unlocked. I ask the friend what she thinks, and she agrees, thinking she'll also get out.
I bring out the keys, but only unlock my girlfriend. We screw like rabbits until we're both utterly spent. We invite the friend to participate, and I suck on her nipples while my girlfriend kisses her. My girlfriend guides her head down, and locked, the friend licks my girlfriend to an orgasm. She watches and participates, but the frustration builds as she can't get off or join fully in our fun, her own hand often sliding down to her pussy only to find access blocked.
Half way through, we tell her that we'll unlock the belt, here and now, but because it's not all the way through the trip, there'll be a price. Instead of getting the key fully tomorrow, the belt goes back on in he morning, and I keep the key for two weeks this time.
Horny and sex addled, she immediately agrees, and her belt joins my girlfriends at the foot of the bed, the wild threesome continues, crushingly powerful after a week full of sexual tension and denial.
In the morning, both girls are refreshed, we all get in the shower then get ready to leave. I stop just before we go out the door and turn to look at the two, bags packed. I ask them if there's anything they're forgetting, and my girlfriend looks sheepish. She wasn't forgetting at all, but was pushing boundaries. The friend blushes beet-red, having actually forgotten, but both strip down and put their belts back on.
Each in turn hands me the key to their belt as we head out the door. I shut it behind us, the three of us off to a final day of sight-seeing - both girls belted again for weeks to come, both their orgasms wholly mine to control.