"Because..." Riku really didn't have a GOOD reason. You could stay warm without sharing. It wasn't impossible to spend a night camping alone. "I don't know," Riku said, just a little lost sounding. They just did. And he fully intended to do so tonight.
Gokudera shrugged. He didn't get them.
"Hey, Sora," Riku said, and dug the extra socks out of the bag. "These are for you."