In my opinion, it's not really ethical. The characters of Spencer and Wren are part of a story universe, and sexualizing them in fanfiction in a way that goes against the original tone of the show or story is inappropriate. It can also objectify the characters and may not be in line with the values the original creators intended.
One alternative could be writing friendship - focused fanfiction. You can explore their relationship as friends, how they support each other, and the adventures they might have together without any sexual undertones. Another option is to write about their professional or academic interactions, if that's relevant in the original context.
As we don't really know what the story is about yet, it's hard to say if it's positive. But if it's about the relationship between Whitney and her dog in a non - inappropriate way, like a story of friendship and loyalty, then it could be positive.
It could potentially be a nature - based genre. Since it has 'the wren' in the title, it might focus on the life of the wren or use the wren as a symbol in a story that is related to the natural world.
Sabine Wren is a significant character in the Star Wars universe, specifically in Star Wars Rebels. A Mandalorian by birth, she brings a lot to the story. She is a strong female character with a complex personality. Her skills in combat and her talent for art make her stand out. She also has a strong sense of justice and loyalty, which is evident in her actions throughout the series.
I haven't actually read this fanfic, but generally, a story about 'kidnapping Whitney' in the Pokemon universe could be really dark. It might explore themes like danger in the Pokemon world that's usually seen as a rather safe and friendly place for trainers. Maybe it's a way to create high - stakes drama.
Whitney Houston was an iconic American singer. She had a powerful voice that could reach amazing heights. Her debut album was a huge success, catapulting her to stardom. Hits like 'I Wanna Dance with Somebody' made her a global sensation. However, she faced personal struggles with drugs later in life, which unfortunately affected her career and health. Eventually, her untimely death was a great loss to the music world.