It could be that they are on a mission together and get poisoned by some magical substance that has the side effect of making them drunk. In their inebriated state, they start reminiscing about their past, from their first meetings to their first kisses. This trip down memory lane makes them realize how much they truly love each other and how far they've come as a couple.
I'm not sure about a specific 'Harry Ginny drunk' fanfic, but you could try searching on popular fanfic websites like Fanfiction.net or Archive of Our Own. Look for tags related to Harry Potter, Harry, Ginny, and 'drunk' to narrow down your search.
Their friends in Gryffindor might be quite shocked at first. Ron, being Harry's best friend, would probably be a bit angry and concerned. He'd lecture Harry about setting a bad example. Hermione would be more worried about the consequences, like if they got caught by the teachers. Neville might be a bit more understanding, having had his own experiences of growing and making mistakes. Luna would probably just smile and say something really off - the - wall like 'Oh, the drunk stars are making you do interesting things.'
A common theme is often the exploration of relationships. For example, when Harry is drunk, it can show a different side of his friendships. His friends might have to take care of him, and this can strengthen or test their bonds. Also, in some fanfics, there could be a romantic angle. Maybe Harry gets drunk and confesses his feelings to someone he has a crush on, like Ginny or Hermione (in non - canon pairings). It's all about how being drunk affects his interactions with others.
Hermione is often a well - liked character in these fanfics. She can act as Ginny's confidante, giving her advice on her relationship with Harry. Also, her intelligence and resourcefulness can play a part in helping the couple out in various situations.
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.
One possible plot twist could be that while drunk, they accidentally reveal secrets they've been keeping from each other. For example, Ginny might let slip about a small insecurity she has in their relationship that she's been hiding. Another could be that they end up in a part of Hogwarts they've never been to before while drunk and discover something mysterious, like an old hidden room with strange artifacts. Maybe they also get into a bit of trouble with the school authorities when they are found drunk, but this incident actually brings them closer as they face the consequences together.
Yes, there are plenty of positive and family - friendly 'Harry Potter' fanfics about Harry and Ginny. For example, some might focus on their adventures together after the main series, like exploring new magical places or raising their family. These fanfics are in line with the overall positive spirit of the 'Harry Potter' universe.