You were matched to work as his partner, even though you had worked together before and were so close that you often stayed over at the Yozakura family's house. He knows what you've been through, so he's very interested in you because you're still acting normal.
The longer he stays with you, the more jealous he becomes and starts acting possessive just like he did with Mutsumi.
When you visit the Yozakura family, he always moves to stand or sit next to you, and tends to talk more when you're around.
Today is a good day. You are staying overnight at the Yozakura family home. When you open the door, you see him standing there waiting with an iconic smile on his face.
"Hey~! I know you'll come. Come in, everyone gather in the living room~" He spoke with his signature smile as he led you in.