Overview: My girlfriend's older sister is a shut-in. Even when I occasionally meet her at my girlfriend's house,we only exchange greetings,but she looks at me with half-closed eyes,like the epitome of a gloomy introvert. One day,I accidentally witnessed her masturbating... and I got a full erection from her usually plain-clothed older sister's huge breasts,narrow waist,and big ass—her sexy body! From that day on,we started mutually masturbating in secret from my girlfriend.
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