One day, while I was starting to consider marrying my girlfriend whom I live with, her younger sister Ria came for a sleepover. Ria is a bit of an airhead but she's a completely innocent and pure beauty compared to my girlfriend. Plus, she's easy to push over and a total slut! I secretly fucked her without my girlfriend knowing, but unexpectedly, Ria woke up her erotic desires and started demanding it from me every day, making me get fucked over and over!
