I ended up living with my sister for a week. My sister, who is strict with me in front of her husband, starts cuddling and touching my dick as soon as he leaves. Knowing I was watching, she deliberately showed me having sex with him. My dick was rock hard, and I couldn't hold back from jerking off, but then she suddenly appeared and forced me to have sex with her, getting fucked every day. On the nights before going home, I would have sex with my sister while suppressing my moans next to my drunk and passed-out brother-in-law, fully enjoying this cohabitation!
