Disclaimer: If I owned Yu-Gi-Oh! Arc V, this would have happened in the show. As it didn't, I obviously don't own it.
"Now, bring out that evil dragon of yours!" Kachidoki provoked Yuya as he ended his turn. The boy gritted his teeth, ready to begin his own turn. Yuto appeared by his side, looking too neutral – it looked almost like he was trying his hardest to not look amused, instead.
"He really seems to hate you… wait", Yuto suddenly stopped. Yuya blinked and turned to look at his spiritual friend, only to see the boy with eggplant-like hair turning to glare towards Kachidoki. "Did he just call my dragon evil?! How dare he?!"
Yuya sweat-dropped. "Uh, Yuto…"
"Yuya, show him!" Yuto turned to Yuya, gritting his teeth and frowning. It was so out of character for Yuto, but… somehow, Yuya couldn't help but wonder why this would surprise him – Yuto seemed exactly like he'd take an insult towards Dark Rebellion like his most important person was insulted. "Bring out Dark Rebellion, right now! Show him just what we're like when we're being evil! Screw smiles, this guy deserves to be beaten up to a pulp!"
Once more, Yuya sweat-dropped. "I… think I'll stick to my style of dueling…"
Yuto continued to glare at him until he did summon Dark Rebellion Xyz Dragon.
Once the duel was over, Yuto glared towards Kachidoki with a grin. "That's what you get for insulting my dragon!"
Yuya just sweat-dropped. "Yuto…"
I don't know why, but when Kachidoki said that, I was so expecting Yuto to get all angry about it. And since he didn't, well... this thing was born. I'm sorry that it's so short, but I thought it would be best to leave it like this.