There was a bit of a secret yuri moment regarding these two in the latest chapter. They played a game of hide n seek with Yuuko as "it". If she found someone they had to join her in finding the others. Tooru was the last to be found. And when she was, she thought to herself, "I was hoping to be found first so I could join her". I swear Tooru had a bit of a blush on her face when she looked at Yuuko and thought this!