A/N: To answer your question, Letty-Chan 19, no, his bladder problem will not get better. It will get worse, because I love torturing Izaya-kun~ And YES THIS IS TOTALLY GONNA BE SHIZAYA!
This had to be the most uncomfortable moment of Izaya Orihara's life. After Shizuo offered to change him, they sat in silence for several seconds, until Izaya stood and pulled his pants down. To his everlasting credit, Shizuo didn't laugh or even make a snide comment. Instead, he simply watched as Izaya laid down on one of the cots, blushing furiously. "Do you have any changing supplies?" "...in my bag." Shizuo nodded and rummaged through Izaya's satchel, quickly pulling out a diaper, a small container of baby powder, a package of wet wipes, and a tube of lotion. "Lift your hips," he grunted in a "let's get this over with" tone. The younger boy did so, looking like he wanted to crawl in a hole and die, cringing as Shizuo undid the sides of the diaper. He tried not to think about what he was doing, and cleaned the flea's privates as quickly as possible, almost tearing the fresh diaper as frantically taped it up. "There we go." Izaya sat up abruptly, sliding off the cot and pulling his pants back up. "Thank you." With that, he grabbed his bag and hurried out of the infirmary, which suddenly felt cramped and tight. The flea looks cute in diapers. The thought was completely unbidden, and Shizuo tried to put it out of his mind. It firmly refused to leave, however, and tormented him for the rest of the day.
As Shizuo was exiting the school, he noticed a large group of students clustered around something by the track. Shizuo wandered over curiously, faintly hoping that it was the coach getting fired. It was not. Izaya Orihara was sitting on the ground in the middle of the circle, eyes darting around wildly, searching for an escape to the situation he had managed to get himself into. An upperclassman was crouching next to Izaya, holding his hand and cooing to him in baby talk. The other students yelled insults to Izaya and whispered amongst themselves, pointing with sick glee at the humiliated boy in front of them. Shizuo felt his blood boiling-he despised the flea, yes, but no one deserved this kind of embarrassment. Fortunately, Izaya didn't have to suffer this mortification much longer, as Shizuo punched several bystanders in the face, scaring the others away almost instantly. As he approached his enemy, Shizuo noticed the tears threatening to fall from Izaya's reddish-brown eyes. "What happened to you? Why'd you let them do that?" Izaya blinked rapidly to quell the tears, but a few managed to escape nonetheless. "I...m-messed myself. During gym. It was an accident, I didn't mean to! I told the c-coach that I needed to see the nurse, but he wouldn't listen, and-and...someone pulled my pants d-d-down, and everybody s-saw, and th-they laughed at me-" Shizuo silenced Izaya by (somewhat awkwardly) brushing his hair back and helping him to his feet. "Come with me. I'll change you again, before you go home." "Y-you're not disgu-disgusted?" A shrug. "Like I said, my brother has the same problem. Inconfidence, or something." Despite how upset he was, Izaya rolled his eyes. "It's called incontinence, Shizu-chan." "Whatever."
A/N: Just so you know, the brother Shizuo mentions is Kasuka, not an OC.