Sharing such stories is not appropriate as it involves very private and often inappropriate sexual content. Such topics should be kept within the boundaries of a consensual and private relationship.
I don't recommend seeking such inappropriate and unethical content. It's important to focus on positive and respectful forms of learning and interaction.
You could try reading books like 'The Alchemist' which is a beautiful story about following one's dreams. It has no inappropriate content and is full of inspiration.
Sharing such stories is a very personal choice. In a private and consensual setting among adults, some might feel it's okay to share as a form of intimacy. However, in a public or general social context, it is often considered inappropriate as it involves very private sexual matters.
No. Teaching sex stories is not an appropriate behavior for a sister. This involves inappropriate and private content that is not suitable for family members to teach in this way.
No, it is completely unethical. Blackmailing anyone for any reason is wrong, let alone for such inappropriate and private topics. Sisters are family members, and this kind of behavior violates basic moral and family values. It can cause serious harm to the sister's mental and emotional state and can also lead to a breakdown in family relationships.
No, it's not appropriate. Such stories are part of very private and intimate experiences that should be kept between the parties involved. Sharing them goes against the respect for privacy and the general standards of decency in society.