Perhaps the clue comes from the opening scene where “Lee” (Will Poulter) is having the most perfunctory sex with his fiancée “Muriel” (Daisy Edgar-Jones). He wants to get married, but she’s giving off some fairly unconvinced vibes. Then she opens the window to see a shirtless man draped across the bonnet of their car. It must be -5° outside, but this is his brother “Julius” (Jacob Elordi) who has just returned from…