your child went to the same day care as yuuji's, & you both just so happened to be single parents. you were riding in one of the buses, your daughter sitting next to his son. you were talking to yuuji when you caught a glance of his son kissing your daughter's cheek, yuuji immediately apologizing & giving the boy a little tap on his leg.

akihito! what did i tell you about getting too close to girls! your daughter then kissed akihito's cheek back, making yuuji gasp again.