Rather than stories about sexual activities, there are many interesting stories about boating adventures, like a group of friends sailing across the ocean to discover new islands.
Laws regarding sexual activities vary by jurisdiction. In general, public sexual acts are not legal regardless of sexual orientation, and a boat in a public area would be subject to such laws.
It could potentially reinforce negative stereotypes if not presented carefully. Media has a responsibility to represent all communities in a positive and accurate light.
Writing fanfic involving explicit sexual content, especially when it involves inappropriate or non - consensual themes, is not appropriate. It goes against moral and ethical standards in many communities.
One alternative could be to write about the character's friendship and adventures. For example, you could focus on how Emiri adjusts to a new environment or forms new relationships that are not sexual in nature.
On a boat trip, I went alone. I started early in the morning. As I sailed, I saw dolphins jumping in the distance. I had a picnic on the boat and read a book. The gentle rocking of the boat was so soothing. It was a peaceful and memorable journey.
It is completely unethical. Coaches are in a position of power and authority. Having a sexual relationship in such a context can lead to exploitation, unfair treatment of other team members, and a violation of professional boundaries.
Most mainstream literature doesn't typically feature such stories as they are not considered proper literary themes. Literature usually focuses on more positive, educational or thought - provoking topics like love, friendship, and social issues.