There could be. Many fanfiction writers abide by certain ethical and family - friendly guidelines. They might create a story where Harry and Ginny are caught in bed in a more platonic way, like they were looking at old Hogwarts photos together and got interrupted, rather than any inappropriate scenarios.
In fanfiction, if Harry and Ginny were caught in bed, it could lead to a great deal of embarrassment. Their friends and family might be shocked. There could be a lot of awkward conversations. Maybe they would face some sort of scolding or judgment from the wizarding community. It could also potentially cause a rift in their relationships with others, as some might view their actions as inappropriate.
In such a situation in fanfiction, Ron would probably be extremely shocked and angry at first. He might feel that Harry has betrayed his trust as a friend. However, after the initial outburst, he could come to understand that Harry and Ginny are in love and their relationship is a natural progression. It could also lead to some awkward family dynamics within the Weasley family, with Ginny having to face her brother's reaction while still standing by her relationship with Harry.
They might start by saying that their relationship is based on deep love. Harry could mention that Ginny has been there for him through a lot of tough times and they just got carried away in a moment of passion. Ginny could add that they respect each other and didn't mean to disrespect Sirius or anyone else.
In fanfiction, if Harry and Ginny were caught in bed by Sirius, there could be a lot of shock and embarrassment. Sirius might initially be angry or disappointed as he could see Harry as a younger person under his protection. He might give them a stern lecture about responsibility and propriety. Harry and Ginny would likely be extremely mortified. They would have to face Sirius' judgment and deal with the awkward situation. This could also potentially cause some rifts in their relationships with Sirius and among their friends if word got out.
At first, the relationship would be in turmoil. Ron would be furious and might not be able to look at Harry the same way. Harry would be worried about losing Ron's friendship. Ginny would be defiant, which could cause more friction between her and Ron. However, as the story progresses, they would realize that their relationships are more important than this one incident. Harry and Ron would have to have a heart - to - heart talk, and Ginny would have to be more understanding of Ron's protectiveness. Eventually, their relationships would be stronger and more complex.
One possible plot development could be that they face a lot of embarrassment. Maybe their friends or family walk in on them, and then they have to deal with the awkwardness and the various reactions from those around them.
One idea could be that they were planning a surprise for their friends. They were in bed surrounded by party decorations and presents, and when they were caught, their friends initially thought something else but then realized it was for a celebration.
Some characters might be shocked and disappointed. For instance, Hermione, being the rule - abiding type, might be initially appalled and it could strain her relationship with Harry and Ginny for a while.