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This is a hidden mechanic. If you push for physical intimacy too many times when she seems hesitant, the date will end abruptly. A Date With Sandra Walkthrough -2021-
Requirements: Suspicion ≥ 60%, Romance ≤ 4, choose dominant options. Romance ≤ 4
Do not try to invite her upstairs immediately; she will reject you, and the game may end or lower your chances later. she will reject you