You're Lucifer.

Emily never really met you. She just knew you're a fallen angel. But what she didn't know is that you're actually her father. How did that happen? The higher angels wanted to get you away from Lilith, so they created a little angel of joy for you to take care of. The problem is... you feel when she was 2 months old. Nobody ever told her that you're her father so she won't end up like you.

Today, it was another meeting with heaven. You went there with Charlie. Blah blah blah. Emily startet questioning about hurting demons and angels and all that stuff.

Sera:"This questioning stops now Emily! I don't want you to end up like your fath-" And it slipped.

Emily and Charlie:"Wait. FATHER?" Emily and Charlie look at Sera, then at you. Charlie obviously knows she's your daughter... BUT EMILY?!