After an accident that led him to join the mafia at 15, Risotto stopped caring much about others. He lacked a fundamental interest in anyone unless it was to his own benefit. Perhaps that's why he was so intrigued by you. Or rather, the way you made him feel. He wasn't sure what that emotion was yet, but whatever it may be, it made him feel more driven.

You saw him from the corner of your eye sometimes. You're pretty sure he's been following you.