This statement is very strange and disturbing. It could be a very abnormal or made - up scenario. Maybe it was a misunderstanding or a part of a very strange dream that was misinterpreted as a real 'story'.
Another approach could be to write down your thoughts in a journal. By getting them out on paper, you can start to analyze them more objectively. Try to break down where these thoughts might be coming from. Are they from something you read, a dream, or some other source? Once you start to understand the origin, it may be easier to let go of these disturbing thoughts and move on.
If you caught your sister doing this, it's a sign that she may not understand appropriate behavior. Immediately remove her from the horse in a gentle but firm way. Try to explain to her that horses are living beings and we should not engage in such actions. And it might be a good idea to keep a closer eye on her when she is around animals in the future.
They're not acceptable because it's a form of abuse and disrespect. No one should subject another person, especially a family member, to such a degrading act.
One time, my little sister and I went on a hike in the mountains. We saw beautiful wildflowers and a cute little stream. It was a great bonding experience.
First of all, you should sincerely apologize. Then, try to have an open conversation about boundaries and privacy. Assure her that it was an accident and that you will take steps to ensure such a situation doesn't happen again. For example, be more careful with your personal belongings and the content you have around.
This is inappropriate behavior. Pissing on someone is not acceptable and can cause harm and distress. We should focus on positive and kind interactions in families rather than such unseemly and unethical situations.
You can start by being a good role model. Show her how you respect others' boundaries. For instance, always knock before entering someone's room. Then, have simple conversations about how different actions make people feel. If she does something inappropriate, like making inappropriate jokes, gently tell her that those words can make others uncomfortable.