No. Such topics are inappropriate for public discussion as they involve private and often sexually explicit content that violates public decency standards.
It could be normal if you both have had open conversations about sexual preferences and fantasies. If you are okay with her exploring her sexuality in this way and she feels comfortable with you being aware, then it can be a normal part of your relationship dynamic. But if it makes you feel uneasy or if there hasn't been proper communication, it might not be a healthy situation.
Well, it could be that she was exploring her own sexual desires in a solo way. Maybe she found that the black dildo had certain features she liked, like its shape or texture.
Definitely not. Such content is inappropriate in almost all social and cultural contexts. It goes against the values of decency and respect for others, and can also be considered offensive and unethical.
I'm not sure specifically what that particular 'giant black dildo story' is about as the title is rather unclear without more context. It could potentially be a fictional or perhaps a very strange and specific anecdote within a certain community or narrative.
Perhaps 'My Girlfriend and an Uncomfortable Scene'. It allows you to approach the topic in a more tasteful manner, without getting into inappropriate details.
The significance of 'the giant black dildo story' is very much in question. If it is a story that was created to make a statement about sexuality, power, or some other complex concept, then it could have significance within the framework of those discussions. But if it's just a silly or shock - value story, then it may have no significance at all, other than being a strange and somewhat off - putting title.