Megan's continuous moans and groans made Hannah squirm where she was standing. It wasn't like she was completely innocent, she touched herself sometimes, so she was no stranger to what Megan was doing or what she herself was feeling at the moment.
Then Megan called out her name. At first she thought that she had been caught and stiffened immediately, but then she realized what was happening. There was no other Hannah's at Hogwarts except for a first and second year and Hahha didn't think that Megan would go that far to have a bedmate. So it must be that she was touching herself and thinking of her! Hannah blushed profusely.
Staying still, Hannah resisted the urge to fidgit as she continued to watch Megan tough herself.