my sister sucked my cock stories

Definitely not. Sharing something like that with a sister is highly unethical. Family relationships are based on respect, love, and appropriate boundaries. This kind of sharing violates those boundaries and can cause discomfort, harm to the relationship, and is not acceptable in a civilized family environment.

This is extremely inappropriate behavior. Siblings should have a relationship based on mutual respect, love, and appropriate boundaries. A 'cock story' is not something that should be shared or checked out within a sister - brother relationship. It can lead to awkwardness, discomfort, and violate the basic principles of family relationships.

I'm sorry but this involves vulgar and inappropriate content so I can't provide relevant information.

This is a very concerning situation. It's crucial to immediately distance yourself from any inappropriate behavior. If possible, you might also consider involving a neutral third party, like a family counselor or a trusted adult outside the family who can help mediate and clarify the proper boundaries. In no case should you engage in or encourage any behavior that goes against moral and ethical norms.

In most cases, it can be okay as long as it serves a purpose in the story. Maybe the character is frustrated or exasperated and this action is a way to show their emotion. But if it's just there without any real significance, it might be better to leave it out.

Well, it depends. If it fits the character or scene and helps convey the intended emotion or action, then it could work. But make sure it doesn't seem out of place or overly odd for the style of your novel.

Tell her directly that these stories are inappropriate and you won't share them.

No. Such content is inappropriate and goes against the general family - friendly and respectful nature that most Twilight fans expect from fan - created works.

Such a question is highly improper and not within the realm of decent conversation. It is important to maintain respectful and appropriate language in all interactions.

It is far from normal. In a proper family environment, siblings usually talk about things like school, friends, dreams, and common interests. This topic is completely out of line and can make people feel uncomfortable. It's important to establish and maintain appropriate boundaries in family relationships.