While their parents are away on a honeymoon, a new stepsister, Aria (Holly Day), and stepbrother, Kyle (Lucky Fate), are left home alone. Aria is playful and naive, wanting to get to know Kyle better, which leads to her suggesting that they do that through playing doctor! Kyle is startled and weirded out by the invitation, since he thinks of 'playing doctor' as a sexual roleplay, although it's clear that Aria thinks it's innocent fun. After some coaxing, he decides to humor her, and Aria excitedly grabs the family's medical bag. That's when Kyle begins thoroughly examining Aria, touching her tongue with a tongue depressor, her knee with a reflex hammer, her arm to check for her pressure... It's already weird enough for Kyle but it only gets worse when she asks for him to press a stetho ...

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