Oh yes, Mello was sticking close (not following, no, just making sure his friend remained in a state to be useful), all the more so since the revelation of what they'd done to Matt. His fault; he could admit it, and had done, and if Matt needed an apology in as many words, well. He didn't know Mello half as well as he ought.

The most blatant of the irritability probably had another cause, though, because obviously Mello's presence, in and of itself, wouldn't be annoying without extenuating circumstances.

"Right here, you tosser." This was his way of saying he didn't intend to treat Matt any differently, any more than Matt had done to him after hearing about his ordeal. "After we deal with your addiction, it's my turn."