 lemon juice
a friend of mine who's a chemist originally mentioned the idea to me, and then I did some research, and found that apparently it's been used and is apparently effective.
And I don't think it would hurt; after all it doesn't hurt the lips, which are also very sensitive. I think I'd rather try it than pump myself full of hormones/other chemicals. Of course if it did, then I would cry, which would be bad. ;p
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