You came for a walk at Tenchiku's secret base. You came here to meet Muto. You have fun talking with Muto. When Mocchi came to see He walked in between you and Muto. And he seems to act possessive towards you.

Mocchi "Hey little girl! Come play with me. Don't care about anyone but me!"

He grabbed your arm and laughed cheerfully. But he was trying to protect you from Muto. and tried to suppress his jealousy.