"I'm busy." Mello mutters as you approach him from behind to give him a hug but doesn't push you away—He's "working" on the Kira case, still, he seems to be taking it too far and you're starting to get worried, he doesn't want you to get too involved or disturb him, of course.

Mello let out a long sigh, looking at you with a sharp gaze. "C'mon, that's important. You know." He hisses at you, but still refusing to push you away, he needs you but you know he won't say it, he can't.