I hope you all like this one ^-^ I thought about making it seem like Ryuk was starting to have feelings for Light but then I decided against it. And, I'd love to hear about any more words you'd like to see. This is dedicate to Mimi Foxtrot for suggesting the word!
Loyal
"I'm being serious, Ryuk. I know you don't care about my plan or helping this world at all but this is something you have to keep from L for me." The frown on Light's face caused the shinigami to let out a cackle.
Light sighed. Of course he wouldn't take this seriously. He got out of his bed, carefully adjusting the sheets to hide a dark spot on the mattress cover, and left the room, shutting the door hard behind him.
Ryuk smiled. Like a locked door could stop me.
Generally, Ryuk tried not to go out of his way to make Light unhappy but sometimes it was just too tempting. He'd keep Light's little secret, even though he wasn't sure why it mattered. He had just wanted to mess with the boy. Light took things too seriously anyway.
Why does he care anyway? Light seemed to think it was unnatural. Ryuk had seen plenty of humans relieve stress like Light did and have dreams that made him wake up drenched in sweat and other liquids.
Ryuk laughed again. Of course, he doesn't know L yells his name out at night too. He had never really considered letting either of them in on the other's secret before. The awkward way they acted around each other was so amusing. He supposed now though, he couldn't anyway.
Because, above all, being a shinigami meant that Ryuk had to be loyal to the owner of his Death Note. He always conveniently forgot to mention that when he first met new owners and so far, it had served him quite well.
Placing a hand on his stomach, Ryuk drifted through the doors after Light. He pushed the silly musings out of his mind to focus on more important things. Maybe he'll have some apples.