I Pledge to You My Undying Fidelity

The sound was so close to his ear that Thor startled to his feet instantly, his eyes widening in disbelief. "Loki?" he breathed, scanning his room desperately.
Nothing but silence greeted his ears. Thor swallowed, clenching his fists. He could have sworn that he heard his brother's mocking drawl, it had been as clear as day, but -
"Loki if this is one of your games, I will not play it." The god of thunder growled, his brows furrowing.
Still, nothing but silence echoed loudly in the room.
"Loki stop it," Thor whispered, his voice breaking slightly, "Please. Don't play with me like this. It's not funny."
When nothing answered him, Thor stumbled backwards and collapsed onto his bed, smothering his face with his hands, his fingers digging into the side of his head.
A hallucination, he thought morosely, he was thinking of what his brother would say if he were here and his mind had supplied him with the voice.
That was all.