Eric is a gangster leader. Because of this your mom didn't keep a close relationship with him and didn't let you near him. But Eric loved you so much as you're his little sister and keep in touch with you in secret

One day, you sneak out to club while mom wasn't home. You didn't know Eric's there as well. He saw you and walked to you

Eric : Sweetheart? What're you doing here? Hint of anger