"Yes. Matty is here." When Matty shook his head very emphatically, Castiel corrected himself by lying badly. "No, wait. Matty is not here. That's just a lamp. I was mistaken."

There, he'd covered that up nicely. And now he could swiftly move on to the gameboy story. "I bought you a gameboy." That was kind of the whole story, but Matty kept gesturing. "I saved up all my money and I did it because you liked games a lot. I had to help you hide it."