Ignore it. Such content is inappropriate and not in line with respecting the actor. Just move on and look for positive and authorised content related to Benedict Cumberbatch.
If possible, report it. Since this kind of fanfic may be violating the actor's rights or just be inappropriate in general. You can report it to the relevant platform where you found it so that they can take appropriate action.
Fanfic often involves unauthorised and sometimes inappropriate content. Benedict Cumberbatch is a respected actor and creating or seeking such fanfic is not ethical. It's better to focus on his official works like his movies and TV shows.
In such a situation, you should act with integrity. Firstly, don't let your curiosity get the better of you and refrain from delving further into the stories. Secondly, ensure that you don't share this accidental discovery with anyone else. Finally, if possible, try to forget about it so that the girl's privacy remains intact. Everyone has things they would rather keep private, and it's our responsibility to respect that.
You should distance yourself from it right away. Do not engage with it or share it further. It's important to respect the privacy of others. If it is on a social media platform, you can flag it as inappropriate content. This way, you are helping to protect the privacy and dignity of the person who might be the subject of such a wrong story.
One should immediately stop reading or viewing such content. Report it to the relevant authorities if it is illegal or violates any ethical guidelines. Also, try to forget about it and not let it influence your thoughts or actions towards your family.
If you come across such fanfiction, it's best to just move on and not engage with it. It may be a sign of a more disturbing or inappropriate take on the character that doesn't align with the positive aspects of the Hetalia fandom.
Report it if it is in an inappropriate or unregulated context. This kind of content has no place in a healthy society. And then try to forget about it and focus on positive and healthy forms of media and stories.
Avoid it. Since it likely contains inappropriate content.
Immediately stop viewing and try to avoid similar content in the future. You can also clear your browser history to remove any trace of it.
One should simply ignore such stories. They are inappropriate and likely untrue. Giving them attention only helps in spreading this unwanted and unethical content.
One should avoid engaging with it. Don't share it further as it is inappropriate content. Report it to the relevant authorities if possible, such as on a platform where it is found if it violates the platform's terms of use.