One common plot could be Draco getting cursed and the stomach cramps being a side - effect of the curse. In fanfiction, the author might use this as a way to show his vulnerability. Another plot could be Draco eating something bad at Hogwarts and getting severe stomach cramps, leading to a series of events where other characters have to take care of him.
They might describe it as a sharp pain that won't go away. For example, 'Draco clutched his stomach, a sharp pain stabbing at him like a thousand needles.'
In some fanfictions, Draco might have a stomach ache because of a potion gone wrong. He could be experimenting in potions class or secretly trying to make some dark potions on his own. If the ingredients are not measured correctly, it can lead to all sorts of physical discomfort, like a stomach ache.
Others may focus on his facial expressions. They could write that his face turned pale, his brows furrowed in pain, and beads of sweat formed on his forehead as his stomach ached. This shows the visible effects of the stomach ache on him.
There could be a fanfiction where Hermione is in the middle of an important exam or task and her period cramps start. This would add a lot of drama as she has to deal with both the physical pain and the pressure of the situation. She might find an unexpected ally who helps her get through it.
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One common theme is friendship. In these fanfictions, Hermione's friends often come to her aid when she has cramps, highlighting the strong bonds between them. For example, Harry might bring her a warming charm or Ron could offer some words of comfort.
There could be fanfiction where characters support each other during period cramps. Like in a group of friends' fanfic, they all come together with different home remedies and comforting words. One friend might bring a warm compress while another shares a secret family tea recipe.
To portray period cramps realistically in fanfiction, the author can describe the physical pain. For example, sharp stabbing pains in the lower abdomen or a dull ache that won't go away.