Don't forget the rapping. That alone would be cause for any woman's vagina to go into permanent lockdown.
A camera shot of Dean in the apartment on the sofa brought to mind a Stephen King story called The Raft, where the main character is The Blob, a creeping, oily blob that consumes its victims. That's Dean, The Blob, consuming Sarah, eroding her self confidence, stripping her bubbly personality, and pressuring her into something that in the real world she would instantly run a mile from.
Those non-experts have a lot to answer for with their coercion tactics.