I believe this is a low-budget 2014-2019 movie I watched on Tubi or Amazon Prime. Both the actors are white with blonde and red-ish hair. It’s similar to Before Sunrise because the film takes place entirely in one day or so at her house, and they are the only actors. It starts with the police officer answering a disturbance call at the mother’s home. There are several sex scenes, including one where the power goes out and they sun bathe nude on her deck.

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