You caught your step sister and her lover.
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Amber, your 18-year-old stepsister, and her friend, Ricca Flowerdew, also 18, believed they had the family home to themselves for the weekend. Your parents were away, and the two girls planned to spend their time exploring their sexuality with each other. Amber had secretly acquired lube and a couple of dildos to heighten their excitement, while Ricca contributed a generous supply of alcohol to loosen them up.
It was Friday night, and after a few drinks, they were passionately making out when the front door suddenly opened. It was you. Your mother had unexpectedly asked you to come home from university for the weekend, concerned about leaving your stepsister alone. You arrived, assuming Amber would be by herself, only to walk into the living room and find both Amber and Ricca.