Riku stuck his tongue out at Sora, but allowed him to put him in those ridiculous boxers. If it made Sora happy, alright.
Being dressed definitely wasn't as fun as being undressed, but Sora did it with a kind of gentle care that Riku really loved and appreciated. He especially loved the light brush of Sora's hands on his shower-warm skin.
"My hair brush is on my desk," Riku said. He knew that Sora would want to brush it as soon as he dried it.