One possible reason could be that Harry is too focused on his fight against Voldemort and doesn't want to put Ginny in danger. He might think that being with her would make her a target for his enemies.
The relationship can be shown as one of deep trust. Ginny feeling comfortable enough to fall asleep on Harry indicates she trusts him completely. It could also show a sense of intimacy, like they are in a very close and personal space.
Alternatively, Ginny could be very mature about it. She might respect Harry's decision, even though it hurts. She could choose to step back and give Harry the space he seems to need while secretly hoping that he will change his mind in the future.
Ron can also be included. He might be a bit clueless at first about their relationship, but then he can become a source of comic relief as he tries to play matchmaker or accidentally gets in the way of their romantic moments.
One great 'Harry Potter Ginny' fanfic is 'Ginny's Year' which delves into Ginny's experiences during her years at Hogwarts. It really fleshes out her character and her relationship with Harry in a very believable way.
In a fanfic, the Room of Requirement could be a place where Harry and Ginny go to practice their magic together. They could be working on new spells or defensive techniques. Ginny could show Harry some of the unique magic she learned from her family. And in the process, their relationship deepens as they rely on each other and learn from one another.
Well, it could be due to Ginny's past experiences too. She was possessed by Voldemort when she was younger. Harry knows how terrifying that was and doesn't want her to go through any more trauma. So, in fanfic scenarios, this makes him overly protective, always hovering around to make sure she's okay and not in any danger.
One popular 'Harry forces Ginny fanfic' could be 'The Unexpected Bond'. It explores their relationship in a unique way, with some interesting plot twists that keep readers engaged.
They're popular because Harry and Ginny's relationship in the original books has a lot of potential for further exploration. Fans love to see more of their love story, like their daily interactions and how they deal with family and friends.
I really like the fanfic 'Among the Stars with Harry, Ginny and Luna'. In this one, they go on an unexpected journey through a magical portal that leads them to a new, uncharted magical land. The author does an excellent job of developing their relationships further. Harry and Ginny's love is portrayed more deeply, and Luna's unique view of the new world adds a lot of charm to the story.