Rebecca Lewis: How did I not know about this sooner?

Simon Lewis: You and Mom both did. I had a vampire friend hypnotize both of you to forget.

Rebecca Lewis: Oh… Can you do that too?

Simon Lewis: Yeah. And I… I will totally do that for you too.

Rebecca Lewis: No! No. Simon, I wasn’t there for you once. And I will never not be there for you again. I’m your big sister… and I’m always gonna love you. Warts, fangs and all.

From Shadowhunters – Season 3 Episode 10: ‘Erchomai’ (3×10)