Jonas
Why should @Jen take the risk when it is safer to try the CB independently of the parents?
First, she wants to find out what it is like to wear it for longer. It may well be that she has had enough after the first time and wants to leave it at that.
If she wants to go further, she can always think about how it can be safest for her. Several options have been listed so that "all or nothing" is not necessary
Reasons a chastity belt sucks?
- Edited
I definitely still think she could ask for the key and do the trials for herself as I suggested above. However, looking back, I think that with the help of good advice on here, she's already established that they cannot force her to wear it, (what would friends/family say? etc), so the risk is negligible, the only concern here is avoiding further bad feeling. Ironically, going through with the original agreement might help to address just that.
First, she wants to find out what it is like to wear it for longer. It may well be that she has had enough after the first time and wants to leave it at that.
As I understand it, the deal was that belt could be removed for any reason during the trial period.
Overall, it kinda depends on her motivation. If she's seriously considering chastity then Ines is right, it's not a fair test of if you have the key in your possession. Further, if the belt is just being considered for use as a toy then it might be kinda unfair on the parents to demand the key.
If however, she is simply attempting to keep to the previous agreement, or remains generally unsure about the whole idea, then the parents could help this by supplying the key for the trial period.
- Edited
Do you think they would accept?
I think so,too.
I agree,she has the upper hand,as I said.
But they may accept it is only a try,but don't want to give her the keys.
Right.
Ines the feeling would be very different of depend and trust in a keyholder.
Yes,if she has her keys,it would be very different than "true chastity".Even for a voluntary wearer.
You can try it to convince them,if you want to try it.Trust you by giving you the keys during your trying,if they want you to trust them if you decide to continue wearing after(without having the keys,so).But remember the feelings would be very different.
Except if,as @Jonas suggested,the lock and the keys are changed after the trying,if she decides to wear it.
Jonas And it is far better to test the belt a little each day over, say, a month than it would be to suddenly to try it for three days straight and end up sore and stressed out.
That's why we advice for a training before wearing it.
Jonas - Gently experiment with not having the key.
How would you do it?
I agree.
gwen You can't hug your friends without risking some questioning looks.
It can be done.Only taking a bit extra care.
Generally,we can take off/change our clothes without needing a key!
gwen You can't hug your friends without risking some questioning looks.
My belt looks like it sits very low but yeah upper body hugs only!
Yikes what about sitting on a flat seat - like next to someone on a bus seat?
Jonas she's already established that they cannot force her to wear it
Yeah that can't happen - not here - and they know that I know it so it's over really. But I want to try in my own time - not have any promises or pressure or anything which might make my anxiety blow up.
Jonas If however, she is simply attempting to keep to the previous agreement...
not doing any more agreements. Curious is a good way of putting it - maybe even curious about long term but there is issues and I cant even think how so not now I think.
Jonas I still think the 3 day trial isn't sensible - better to take things much more slowly, a couple of hours a day with regular unlockings
no that stupid thing was to keep building up until 3 days is possible, not start all at once.
Vanessa Do you think they would accept?
(asking for key).. no idea really just a bit scared about bringing it up
When I'm being chased by the Masturbation Monster my aim is to chuck everything I can into it's path as I beat a hasty exit out the door! 
Anything that makes it more difficult to act out helps. Hence porn filter, distractions and the belt itself. I mean nothing is totally secure, but it all helps. It's often more of a question of making "escape" just a little too much effort for you to bother. 
I used a combination key safe a whole lot, using an app to do time-locking. After this I used to wait for my partner to open when home from work. That led on to occasional lock ups that were longer than I intended and an increasing degree of making me wait. 
Of course when I got to the full 24 hours, the key is just for emergencies really.
If/when you want to try it, you could pick a quiet moment and say what you wrote above to your father:
"I want to try [the belt] in my own time - not have any promises or pressure or anything."
If the belt and key magically appear then great, if the awkwardness starts up again maybe this was the wrong time/place to try chastity.
Vanessa Yes,if she has her keys,it would be very different than "true chastity"
For me it's the same as chastity belt without lock.
Vanessa You can try it to convince them,if you want to try it.Trust you by giving you the keys during your trying,if they want you to trust them if you decide to continue wearing after(without having the keys,so).
It souldn't be such an option. Either try locked belt or not try at all.
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Renita It souldn't be such an option. Either try locked belt or not try at all.
As things stand; the belt is in a suitcase, parents disappointed, Jen stressed. Trying the belt would address all of these and maybe solve them.
Even though I took the whole process very slowly, and had access to the key, my belt is just as secure at the end.
Joh From what I see it looks similar to one of Fancy Steel.
yes but i am as unconvinced about the quality of fancysteel as i am about the quality of a cheap belt. of course @Jen can order a belt for 50$ on the internet and test it, but it would probably not be a comparable result and would lead to disappointment.
Jen But I want to try in my own time - not have any promises or pressure or anything which might make my anxiety blow up.
As they kept the keys for the locked chastity belt,it can be hard...
Jen Curious is a good way of putting it - maybe even curious about long term but there is issues and I cant even think how so not now I think.
You would be able to know more if you want to try long term or not after a short trying,but not without a try,I think.
Jen (asking for key).. no idea really just a bit scared about bringing it up
You should remember that,now they've accepted you would not wear it,you can decide what would be the conditions for trying.They don't accept these?Ok,so you wouldn't try it.I guess they would prefer to let you try it under your conditions,hoping you accept to wear it after it,than making you not even trying.
Jonas I used a combination key safe a whole lot, using an app to do time-locking.
It could be useful for @Jen,yes.
Not a good idea.It would be less comfortable than her own belt,and could disgust her even more of chastity,for the wrong reasons(cheap belts and major brand's ones are very different).
I agree.
Renita It souldn't be such an option. Either try locked belt or not try at all.
Considering the situation about chastity belt in her home,I think it could be a good way to trust each other better,necessary if she decide to use it.
Ines At the end you learn to sit.
I agree.
Vanessa I guess they would prefer to let you try it under your conditions,hoping you accept to wear it after it,than making you not even trying.
i don't know if i agree with this statement. of course the parents would prefer @Jen to try, but i doubt if they will accept it on @Jen's terms. parents prefer to keep control and i don't know how this will develop in the long run.
Jen
What kind of lock does your belt have? Is it a normal padlock, small padlock, or the box with the internal locking mechanism that only the key can extract? If your parents are not giving you the key, you might as well file it and try to destroy the padlock yourself. It'll take about 4 hours, but it'll be worth it!
Jen
If you ever get lockpicking tools, I can guide you how to get it out. I do suggest practicing on a bigger masterlock first. If you do have the box with your chastity belt, I'd also say just destroy the lock and keep the new lock and key to yourself, without your parents knowing about it. This way, you can try it out and still have your freedom.