In many fanfictions, if Harry and Ginny were caught by Sirius, Sirius might be initially protective and concerned. He could question their actions, especially if they were in a situation that seemed dangerous or inappropriate for their age. For example, if they were out after curfew or in a restricted area. Sirius might give them a stern lecture about being responsible and the importance of following rules, while also understanding their adventurous spirits as he was quite the rebel himself when he was young.
Sirius might react with a mix of surprise and protectiveness. He would be like an older brother or father figure. He'd make sure they were safe and not doing anything too risky.
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.
There's also 'Caught in the Act'. This fanfiction delves deeper into the reactions of their friends when they see Harry and Ginny snogging. It's interesting because it shows different perspectives, like Hermione's initial shock and Ron's teasing. The descriptions of their relationship are really sweet and in - character.
One great fanfiction could be 'The Unforeseen Bond'. In this story, Harry, Ginny and Sirius are brought together in a unique way. Sirius, who has a special connection with Harry, also starts to mentor Ginny, leading to some really interesting adventures. It's a story full of friendship and magic.
One of the best elements is the exploration of their relationships. Sirius can be like a protective older figure for Harry and Ginny. For example, in some fanfics, he teaches them advanced magic spells that they wouldn't learn at Hogwarts so easily.
The relationship could become strained. Sirius might start to view Harry differently, with a bit of wariness. He might not trust Harry as much as before in terms of making good decisions. But it could also lead to a more open relationship where they talk about things they previously avoided, like relationships and feelings.
After being caught, they could be forced to keep their relationship more low - key for a while. This might involve sneaking around more carefully. They may also have to deal with the opinions of others, like Harry having to face the Weasley family's concerns about their relationship. Ginny would have to assure her family that Harry is the right person for her.