Definitely not. Incestuous relationships, even if it just seems like sneaking around without a full - on relationship, are frowned upon. It can create a lot of problems within the family unit. Family is supposed to be a source of support and stability, and this kind of behavior can shatter that. There are also social and moral taboos associated with any form of relationship between cousins.
The first step is to recognize that what you're doing is wrong. Then, you should cut off all private and inappropriate interactions. Avoid being alone together. If necessary, you can confide in a more mature and trustworthy family member who can help keep you accountable and guide you to make the right decisions.
I don't actually have a'sexy cousin story' because having inappropriate relationships or feelings within the family is not acceptable in society. Family relationships should be based on respect and propriety.
Rather than having 'hot sexy' stories about cousins, we can talk about the great times cousins have during family vacations, like going hiking together and sharing fun memories around the campfire.
In most cultures, there are clear taboos about any form of sexual or overly intimate behavior between relatives. We should focus on positive, healthy and proper family relationships rather than creating such improper stories.
Sharing sexual secrets, especially those involving family members in a sexual context, is inappropriate and unethical. We should focus on positive, healthy family relationships and stories that uphold moral values.
Another plotline could involve them sneaking around to investigate a mystery. Maybe there are some strange happenings in the Forbidden Forest, and they have to keep it a secret from everyone else while they try to figure out what's going on. They could be using their skills and knowledge to piece together clues in their limited free time between classes and other activities.
Wearing such revealing clothing within family situations is inappropriate. Family relationships should be based on respect and propriety, so I can't provide a story in this regard.
In most cases, it is unethical. Such stories are often private or not meant for public consumption. By sneaking them, one may be invading someone's personal boundaries or violating the moral code of a community that values propriety and respect for others' sexual privacy.