I have this head cannon that Dick likes to walk around in bare feet even when it's cold. Bruce sees him dangle his legs over furniture and grabs his toes just because he can. Dick gets mad when he does it but like not enough to stop being bare foot.

With this I couldn't decide whether to have this with YJ or Bruce training Dick for the first time. So I'm gonna do both. Here's the YJ one.

EDIT: TW BLOOD/INJURY

Robin came into the training room with a disgruntled look on his face. "What's with you?" Wally asked. "I can't get rid of this baby tooth. It's wobbly but not enough for me to get it out," Robin explained, wobbling said tooth. The tooth was one of his front teeth and would be really noticeable when it was removed. "Aren't you thirteen?" Connor asked. 

"Yeah, why?" 

"You shouldn't have baby teeth at that age," he said. Robin shrugged and kept wobbling it. 

"Stop messing with it, you'll make it sore," M'gann said in a mothering tone. She moved his hand away from his mouth and he frowned. "I think it's adorable, a baby tooth for a baby bird," Artemis mocked. She pulled on his cheek like a grandma would to a small chubby child. "Stop," he complained, swatting her hand away. "Aww is baby bird grumpy?" Wally teased. 

"I hate both of you," Robin mumbled. He had his arms crossed like a pouting child. 

"Did baby bird miss his nap?" Artemis taunted.

Eventually, Black Canary came in to start their training. "Both of you stop teasing Robin," she ordered. Although she thought it was rather funny, Robin's flushed face said he didn't think the same. "Robin, you're up first," she added. Robin nodded and positioned himself a good distance away then got into a fighting stance. "Ready?"

"When aren't I?" They fought with the victory going either way until Robin came up with an idea. Black Canary's punch would probably knock out his stupid tooth. He started to lower his defense as she reeled back to punch him and braced himself for the pain. She didn't notice and sent a punch full throttle flying towards his face. The punch was harder than expected as it thrusted Robin off the platform and onto his back.

They were all deadly silent before suddenly rushing to him. He lay a little dazed for a moment whilst his team and trainer stared at him in shock. Wally helped him up into a sitting position. Robin shook his head to get rid of the daze and swiped a tongue across his front teeth. There was one missing and the metallic taste of blood filled his mouth. He could feel the tooth floating in the blood. Robin put his hand to his mouth and spat in it. His bloody tooth shone clear as day in his hand. "Oh my God," Black Canary muttered, gasping a little. 

"You knocked out my tooth," he stated with a slight lisp. They stared at the tooth then back at him. "You knocked out his tooth!" M'gann shrieked. 

"He just said that M'gann," Artemis told her. "That's so gross," she added, glancing at the blood. "Tastes gross too," Robin replied.

Wally ran off and returned with some kitchen paper to wipe the blood off his hands. "I'm so sorry Robin I didn't mean to punch you that hard I thought you were going to block me," Black Canary explained quickly. "You don't need to say sorry, you knocked it out like I knew you would. I didn't expect my jaw to hurt so much however," Robin responded, putting the tooth in the paper. His lip was slightly split from the force and he would definitely bruise there but other than that he felt fine. "You let her punch you in the face to get rid of a tooth!" his team shouted in unison. "I've done crazier things," he said, putting the tooth in his pocket. "Now, will you guys move so I can stand up?" They moved and he jumped up with a smile, the blank space causing them to cringe a little. It was still bleeding and the red stained his other white teeth. "What're you going to do with the tooth?" Wally asked, trying not to gag at the blood spilling over Robin's lip. "I might be able to pass for still believing in the tooth fairy but if not I'll just make Batman look at it till he gives me money to stop," he answered nonchalantly. 

"There's still blood on your face, my friend." Kaldur pointed out. Robin wiped it off with the back of his glove, leaving a blood trail on the black fabric. "There's seriously something wrong with you," Artemis said in a serious tone. 

"Probably but my plan worked. Better a hero than a guy at school or a crook," he responded, returning to his place. They glanced at each other with concern. "Are we carrying on or what?" Robin asked, already bored with just standing. "Y-yes. Kaldur, you and Connor are up. I just need to get some water," Black Canary announced. "Batman's gonna kill me," she added under her breath.