Perhaps the final plot twist could be Lana reflecting back that it was Lana’s fantasy since before chapter 1 and she’d set the whole thing up, planting the idea in Daniel’s head.
I think this would be a good plot moving forwards:
Lana confesses everything to Sophia and persuades her to help hide their relationship from Alex. Sophia helps by keeping Alex away from Lana and Daniel, lying for them and plying Alex with alcohol every night. Alex’s drinking gets out of...