Yeah, Roxas was mad. However, Sora was tactless, and he didn't do good with confrontations.
Sora smiled at his brother. It was kind and gentle and, Sora hoped, said 'let's not fight about it'. "Mom says dinner will happen in an hour."
Sora started to take his shirt off. Heck, he might as well just put his pajamas on. "You skipped school. I was worried." He dug his pajamas out of the closet and started to change.