When I turned off the lights and tried to sleep, my older sister suddenly took off her panties and mounted me in the cowgirl position, aggressively attacking me. I couldn't hold back and erupted immediately, but she didn't seem satisfied—while I pretended to sleep, she mischievously used a vibrator to pleasure herself. She went on to tease my nipples and sucked me with a slow, sticky blowjob, forcing a powerful erection. In this situation, there's no way I'll be allowed to sleep... Tahaha...