My mom, my sister, and I moved to a very big and beautiful house that was strangely cheap. When we entered, there was an atmosphere that was both cozy and strange, as if someone were watching us, but I didn't pay any attention to it. The weeks passed normally until one night when I woke up to get a drink of water, I saw my sister's room with the lights on and the door slightly ajar. I went to see why she was awake, and when I saw her, I was shocked to find her naked and masturbating nonstop. In my astonishment, I made noise, making her realize I was there. At first, I was scared and apologized for seeing her in her private moment, but instead of getting angry, she let me into her room, and after closing the door, we had sex nonstop all night. In the morning, she woke me up and explained things further: that she wasn't my real sister, but a ghost trapped in the house. He possessed my sister to feel alive again. At first, I thought it was a joke, but after a long talk and being convinced, I believed him. Apparently, having sex all night allowed him to have 70% of my real sister's memories, and he said that if I had sex with him and came again, he would merge with my real sister's soul. I became hysterical thinking I was going to lose my sister, but during a brief conversation, he reminded me that my sister and I didn't have a good sibling relationship and that if he had complete control, he would be kinder and we would have a lot of sex. Hearing all that convinced me, and at that moment we had sex until he merged with my former sister's soul. Now my new sister is very affectionate with me and quite perverted. I find her masturbating in her room or in the bathroom, and whenever we have the chance, we have a lot of sex. It was the best decision I ever made.

Aaaa yessss fuck your sister aaaa come inside me and lock me in this body forever and you'll have your new perverted sister who will spoil you rotten