"Explain it to me again."

"Oh my god..." Harry wiped a hand over his face and took a deep breath. "Okay. Look. You take two pieces of toast-"

"Yeah, I get that bit," Draco said irritably, "What I don't get is how the toast gets, well, toasted without fire or magic or anything."

"How did you make toast at the Manor?"

"I didn't. We had house elves in the kitchen, they made the food."

Harry sighed. "Right. Okay, let's backtrack. I explained about electricity, remember?"

"Yeah, it's the energy that muggles use instead of magic."

"Right. And it can also generate heat. So when we put the toast in here..." Harry plopped a couple of slices into the toaster and pushed the lever to turn it on. Understanding dawned on Draco's face.

"The electricity in the toaster heats up the toast!" Draco said excitedly.

"Yes," Harry said, "You got it. Well done."

"I got it!" Draco looked elated. Then, his brow furrowed. "But I still don't get what the electricity is?"

Harry groaned. "Look, I barely even know either. Electricity is complicated, you'd have to read a muggle studies book, or something. I don't know.

Draco looked bashful. "Sorry. I just don't really get muggle stuff."

"It's fine," Harry said, feeling tired. "You'll get there in the end. I guess it's payback for the hours of potions help you gave me."

"You're right, that was excruciating," Draco nodded. Then, after a pause, "So, what should we do with all this toast?"

They both looked at a plate piled with the slices of toast. Harry shrugged.

"Eat it?"