I caught sight of my grandpa watching me from outside my bedroom window. He stood there, his gaze fixed on me in a way that made my skin crawl. As I confronted him, my eyes couldn't help but fall to the large bulge in his pants - a clear sign of arousal. When I told him that his behavior was inappropriate, he only seemed to get even more excited. With a sickening grin, he locked the door and demanded that I perform a sexual act with him. I was both horrified and disgusted by his actions, but then he dropped a bombshell - if I didn't comply with his demands, he would reveal to everyone that I had lost my virginity to my own brother. How did he know about that shameful secret? It turns out my brother had bragged about it to his best friend and my grandpa overheard. The thought of anyone finding out this dark secret was too much for me to handle, so I reluctantly gave in to my grandpa's twisted desires. As we engaged in the disgusting act, I couldn't help but feel a sense of pleasure and excitement. My body responded to his touch despite my mind screaming that this was wrong. In between moans and gasps, my grandpa revealed to me that he hadn't been intimate with my grandma in a long time and instead used my cousins for his own pleasure. Just as we both reached climax, I felt something unusual inside me - my grandpa had just ejaculated inside me without any protection. My shock quickly turned into horror as I realized this was all part of his sick fetish - impregnating his own granddaughter. In that moment, before I could even process what had happened, my brother walked in on us. The look of shock and disgust on his face mirrored my own as reality sank in - our own grandfather had taken advantage of us both in the worst possible way.