Often, there is a theme of redemption for Draco. In the original series, he is somewhat of a bully, but in this type of fanfiction, the act of his relationship with Hermione, including taking her virginity, could be seen as a way for him to grow and change. There may also be a theme of secrecy and the consequences that come with it. Since their relationship would be scandalous in the wizarding world, the fanfiction might explore how they deal with hiding it and the emotional toll it takes.
One common theme could be the exploration of a forbidden or unexpected relationship. Draco and Hermione are from different houses in Hogwarts and have been portrayed as rivals in the original series. So, a fanfiction like this might play on the idea of breaking boundaries. Another theme could be the transformation of characters. Hermione, who is known for her intelligence and propriety, might be shown in a more vulnerable and passionate state, which is a departure from her usual portrayal.
A common theme is the power dynamics between the two characters. Draco comes from a wealthy and pure - blood family, while Hermione is a Muggle - born witch. The fanfiction may explore how these different backgrounds play into their relationship when it comes to such an intimate act. Additionally, there could be a theme of self - discovery for both characters. Hermione may discover new aspects of her own desires and Draco may find a different path than the one he was expected to follow in the context of their relationship in the fanfiction.