So it's a setup. Hino is here because he is Yuhi's guardian; it looks like he is giving his blessings to these two being a couple.
So this is why Yuhi-san acted all affectionate when he saw her. He wants to change the contents of the report. But she does not like this method at all.
"Sumire?" A familiar voice called out to her.
Her thoughts broke off once she saw a man with blonde colored hair. Ah, "San."
"Sumire." Sano's gaze brightened. "I didn't think I would see you here. Are you taking a break from work today?"
"Mmm, what about you?"
"I had a conference nearby; it's time for lunch, so I was going to get something to eat."
"It's good you remember to eat your meals."
"That's because I promised you."
Look at his flustered face. It is truly easy for her to use Sano. Sumire quickly stood up and clung to Sano's arm. "Then as a reward for keeping that promise. Why don't we go on a walk?"