It was an accident (private roleplay with bigbabyBakugo)
 

Tamaki Amajiki was apart of the big three and always kept to himself if he had to say something it was to Mirio since they've been best friends since preschool. He needed to go to the bathroom and he raised his hand. The teacher called on him and he tried to get the words out. "I-Uhh." He said before the boy bengan to wet himself infront of everyone including Mirio. Soon some students saw and didn't laugh at the poor boy they felt bad.

Mirio togata was Tamakis best friend and as far as he was convinced it was his job to take care of Tamaki, even in situations like this. The golden haired boy slowly stood and walked over to Tamaki, and speaking in a soft tone. "Cmon Tamaki, I'll take you to the bathroom and help you get cleaned up alright?" He turned to the teacher who gave him a nod as he gently grabbed Amajikis hand.

Tamaki nods and took Mirio's hand and once the two got out he started to tear up and soon started to cry. "I'm sorry it was an accident." He said as he thought he was going to punish him but that wasn't the case for Tamaki. Tamaki just cried as he used his other hand to hide the accident

"No no, listen its alright Amajiki. I know it was an accident, and accidents happen. Now, hows about we go get you in the shower and I grab you some clean clothes him? Doesn't that sound nice?" Mirio spoke in the same soft tone he used before and took the male into the bathroom, starting a shower for him.

"Thanks Mirio." He said and went take a shower relieving his old clothes and waited silently as he stood there naked.

As Tamaki showered Motion rushed off to the males dorm, gabbing him clothes, and then stopping on the way back at his own dorm. He's been planning this for a while but didn't know how to... Execute it. This was the perfect time however as Mirio grabbed a diaper from his closet and rushed back to the bathroom. "Alright suneater, here you go! If you need anymore help just holler, I'll be right here." He smiled his normal dazzling smile.

"Okay mirio." He said as he was rather quick and soon he turned it off amd began to dry off. He stepped out of the shower and covered in a towel.

Mirio handed the introverted male the clothes, and diaper, he'd picked out for him and walked over to the nearby sink to get a drink of water. He was glancing back at Tamaki every now and then, he wanted to see his reaction to the... Surprise undergarment he'd picked.

"What is that?" He asked him clearly seeing the diaper. "Why do you have a diaper?" He asked

"Well Tamaki, you've had accidents before and I just thought this was a good precaution. Since you don't really get to go until last minute and even then, it's a bit too late. "