He joins her in the shower

Harry quickly undressed and entered the bathroom. He could see Hermione's form behind the shower curtain, oblivious to his presence. He grinned as he stepped into the shower behind her.

She screamed when she saw him. "Harry! What are you doing?"

"Taking a shower, what else?"

"Get out!" she insisted.

"Come on, Hermione, you know you want me here," he smirked. "I mean, you could use another set of hands."

She glared at him. "Fine. You can wash my back, but that's it."