Keita is only half paying attention to the conversation, having gotten distracted almost immediately after 'Yes' back to thinking about the problem that prompted his question in the first place.

He doesn't actually know he can't fit in between them. He hasn't tried yet. They're both where he wants to be.

In a move that could have come straight from his father, he simply makes a go for it, and starts squirming his way down between them.

"I want a hug sandwich."