Frustration
The carriage moved as Prudence looked outside at the passing by trees. Her breathing was heavy and she did not dare look back at him. She could swear she had seen death in his eyes. The frustration that she could not up and even slap his hand away really made her angry. Just whenever she thought she could have a little freedom to have her choices here, he snatched that away from her as well.
Vincent wasn't being forceful with her to fulfill his desire yet but everything else was forced for her.