This is an inappropriate situation. You should firmly tell your sister that such topics are not suitable for discussion between siblings. Encourage her to focus on positive, age - appropriate and healthy topics like stories about friendship or adventure.
Yes. Blackmailing is a form of coercion and abuse. When it comes to your little sister, you are supposed to protect her, not engage in such immoral and illegal behavior. The law is there to safeguard the well - being of individuals, and this kind of action goes against all principles of legality and basic human decency.
No. This kind of description involves vulgar and inappropriate content which has no place in proper fanfiction or general discussion related to Harry Potter.
Definitely not. This kind of behavior is unacceptable on multiple levels. Ethically, you are taking advantage of your sister's vulnerability and the family relationship in a very negative way. Legally, it could be considered coercion, harassment, and a form of abuse. You should never engage in such behavior and respect your sister's boundaries and dignity.
No, it is not appropriate at all. Your little sister is likely not ready for such information, and this is a very private and sensitive topic. It should be left to her parents or guardians to introduce appropriate sex education at the right time and in an appropriate way.
No. It is completely inappropriate. Young children are not ready to handle such adult and complex topics. Their minds are in the process of developing and should be filled with positive, age - appropriate knowledge like stories about friendship, family values, and basic moral lessons.
No, it is not appropriate at all. Teaching a young sister about sex stories is completely unacceptable as it is not suitable for her age and can have a very negative impact on her mental and emotional development. Young children should be protected from such adult - related information.
No, it is not appropriate at all. Your little sister is likely not ready for such adult - themed information. It's important to let her grow and develop at her own pace and protect her innocence at a young age.
I seriously doubt there is a legitimate 'Harry Petunia Piss Drink Fanfic'. Fanfic communities generally focus on positive and creative interpretations of the original works. This idea goes against the norms of good taste and the general spirit of fanfiction, which is to expand on the story in a meaningful and respectful way.