[Yes, they were practically brothers. At this point, Shiro certainly considered them more than friends. It had been that way for a long time. He hadn't considered Keith only a friend for... he didn't even know anymore. He had done his best to make sure that Keith had a better life and had someone who cared about him rather than people who thought he was constantly causing problems. He had become Keith's biggest supporter, like a brother]

I would hope that you wouldn't have your wedding without me involved if you had the option. [He said this with a teasing smile. He glanced down at Keith's hand as he put it on his arm] You're my brother as well. I'm glad that I can be here for you.