My sister-in-law, Nonoka, is so incredibly cute that I ended up having a relationship with her, her voice and everything being an exact match. She seems to be a natural at cuckolding, and she tempts me whenever my wife is asleep. It's fine to do it secretly, but the noise from Nonoka's riding position is too loud! Even though we're both trying to be quiet, the intensity of our movements makes it so that even if you can't see us, the unmistakable sound of sex echoes throughout the room! If we get caught, it's instant divorce! But riding me while whispering lewd words in my ear is too pleasurable, I can't take it! I really should have married my actual sister! Aaaaaah!
