Yuhi was not very good at reading people; many have said that he lacks something as a human being. Compassionate and understanding of others. But Yuhi never thought of it to that extreme; after all, he understood Ibuki Sumire very well. Understanding Sumire is enough for him. Right at this moment, he could tell what crazy thoughts were going on in her head. She must be thinking of that kiss...
When the person in charge suggested it, Yuhi did not know how to react. Even if he was okay kissing her, he wants to consider her feelings. He did not get a chance to ask, but if he did, then that kiss wouldn't have happened. Sumire does not look like the type who flaunts her relationship around. Indeed, he learned from their mutual friends that her relationship with Mamoru was very low key.
Sometimes I forgot they were dating.
He heard many people say that and yet at the same time...
The two acted naturally as a couple.