Noboru jolted at Kouki's voice and touch, he'd been so absorbed in the act of letter-writing.
"Yoshida," he said, trying to push Kouki off of him by scooting down the bench and turning towards him. "Don't you have a tree to play in or people to push down the stairs or something?" His glare was strong, but would likely bounce off of Kouki much like everything did.
Noboru and Kouki's history was varied, including the aforementioned stair-pushing incident, and it had all ended in something weird happening to Noboru. So he didn't like to be around the little creep if he could help it, and especially right now, when he didn't want any company.
"No. I'm doing something important, not..." He made a vague hand-waving motion at Kouki like he was trying to make him disappear. "Don't bug me."
The letter, if Kouki were to look down and truly study it, was clearly addressed to Toru Ishinomori, and said something about "I need to be serious for a moment here - I don't mind you as much as I say I do. Actually..."