Not knowing that it was his sister's trick, he drank the drink she gave him in one gulp... and it turned out to be an aphrodisiac!? His sister observed his fully erect dick while he was fast asleep! She couldn't stand just watching and started giving him a blowjob! He pretended to be asleep, but he couldn't resist and ejaculated a lot! His dick still didn't go down, and his sister got horny! To satisfy her desires, she treated his dick like a vibrator and fucked him until he came!