Rin could tell that condoning one another's presence probably wasn't going to happen, he squeezed the bridge of his nose as it seemed his wording caused a misunderstanding. This was one of the reasons why he avoided 'friendly' banter it normally always ended like this. The other people seemed to be having riveting conversations, the ones that were speaking anyway, he didn't see that young boy talking to anyone, which in Rin's opinion made him lucky. The kicking girl wasn't talking either but it seemed some girl had addressed her, in the end Rin envied the boy's solitude at the moment and wish it for himself but he didn't need an enemy out of his neighbor he just needed to stay strangers, friendly strangers at least so he could borrow a pencil or eraser in the future should the time come, acquaintance was unnecessary.
He heard the girl's name Eika Munashii, he was sure he'd forget it soon enough but before he could respond to her the dog was dropped on his shoulder, his eyes immediately glared at the dog as it climbed down and turned into...a pencil holder?
This...Eika made this thing, now he really didn't want to get involved with this person, she wasn't a normal everyday student, regular students didn't make mechanical dogs that turn into pencil holders. 
However he needed to clear up one thing at least, he had enough enemies he didn't need more that and he didn't want the dog.

Rin grabbed the...pencil holder and turning set it on Eika's desk, he stared at her for a moment and with a sigh spoke to her making sure to choose his words carefully.
"Don't want your dog....and I'm not threatening you, it was sarcasm... but it's good that fear in your voice was gone, it'll be hard to make 'friends' in this class like that." Rin said making quotation marks with his hands at friends. "My title is permanent stranger Munashii-san and with that in mind it's time I live up to that title."
With that said Rin turned around before grabbing his notebook hoping that resolved the misunderstandings and conversation, he grabbed his pencil and quickly wrote a sentence down before turning and placing the paper on Eika's desk, he then tapped it with his finger to draw her attention to it and turned back around as if the encounter never happened.
On the piece of paper was one simple sentence, written in bold and in surprisingly good handwriting considering the owner.
[i][b]"Your bandages are showing."[/i][/b]
Rin wasn't about to ask questions as Eika's life had nothing to do with him but if she was going to make 'friends' like everyone else in this class there were some doors that needed to remain closed and going off the red he saw it was probably one of those situation. Generally the affairs of his fellow students wasn't something worth pursuing but the sooner she made friends the sooner she would go sit with those friends, converse, bond, giggle and be generally annoying which would ensure him a bit of privacy in the foreseeable future. He felt a piece at the idea of everyone around his desk going off somewhere, the silence that would follow would be bliss in itself, that was a goal worth pursuing.