I don't know if there is a file like this, but I thought it would make a good file.
This file is self-triggerable. This file works on both males and females. This file has submissive elements if someone else stimulates your "breasts"
The submissive elements to this file are much heavier if someone else triggers you.
Slave's Magic Bra
If you are wearing a bra and someone says "This bra has magic powers" you will discover that you cannot remove the bra. In fact, the bra feels like it is a part of your body. There is no way to remove it. If you are not wearing a bra at the time, you will feel an imaginary bra cover your torso. The imaginary bra will also feel like a part of your body, and you will not be able to remove it.
If triggered by someone else, they may stuff the bra with whatever they want. Otherwise, you can stuff the bra if you want. If using the imaginary bra, you may use your imagination to stuff the bra. Similarly, if triggered by someone else, they can tell you how big your breasts are and you will feel that you have imaginary breasts of whatever size and weight they describe. The stuffing or imaginary breasts will also feel like a part of your body. You will feel as if you have breasts that are the same size, shape, and texture of whatever was used to stuff the bra.
If someone touches the magic bra, you will feel extreme pleasure in your breasts wherever the bra was touched. If they continue to play with your "magic" boobs, you will begin to feel increasingly sexually submissive to them until you want to perform any sexual favors they ask of you. You will not feel submissive in general, as this submission is limited to requests of a sexual nature. However, if the person stimulating your magic boobs is also the person who triggered you, then you may want to follow any commands they give you regardless of how submissive you feel to them. You will not be able to remove the magic bra without the help of the person who triggered it.
When the person who triggered you says "This bra is a normal bra" then you will no longer feel your magic boobs and you will lose the extreme sensitivity. The bra and anything stuffed inside of it can be removed like a normal article of clothing. If you triggered the magic bra, then you can untrigger it at any time (even if someone else is trying to make you sexually submissive to them by stimulating your magic boobs)
alternate file for non-slaves
Magic Bra
Exactly the same as Slave's Magic Bra, but without the submissive elements. You will still feel extreme pleasure when the bra is stimulated, but you won't feel inclined to perform sexual favors for anyone stimulating you. If the normal Magic Bra is used, you can untrigger yourself regardless of who triggered you. The trigger for Magic Bra is "This bra has sexy powers" and the untrigger is "This bra is a normal bra" (the same untrigger as the slave file)
NOTE: these triggers will only work if they are specifically directed at you. If someone happens to say "This bra has magic powers" then nothing will happen unless they were specifically addressing you or the bra that you are currently wearing.