He doesn't look convinced, but Nana turns the conversation back around on him before he can counter and he's suddenly ashamed.

"I..." Yuya rakes his hand back through his hair. "I'm sorry. I knew I was going to feel both of them, but I didn't realize how hard that was going to be when I summoned another familiar."

He's probably explained it before, the connection he shares with Odd-Eyes that lets him understand. But to someone not experiencing it, it's hard to put it in the words that don't seem strangely fantastical and anchor them in normal experiences. Not everyone knows what constant telepathy feels like.

"It just got hard to think with both of them. I'm sorry, I shouldn't have done that..."