Lydia is sure Erica is a hallucination. Not the trashy Erica, with the bad hair and slutty clothes. She’s unfortunately real.
The other Erica is a hallucination. The one who climbs through Lydia’s window and licks her wrist. Who holds her. The Erica who wears a lacy black bra and blue polka dot underwear. Erica who touches Lydia’s hair and tells her she’s beautiful. Who moans when Lydia strokes her, and slips out the window as she’s falling asleep. It's a stolen fantasy. It’s another cruel trick Peter plays.
Lydia wouldn’t be able to handle this gentle hallucination being real.