Hey, I m new to BDSM and found this story quite errotic. http://www.toxictreat.com/posts/st_susanstrict_sisterinlaw But I don't understand what Susan is exactly doing to that guy. What patch and sheath is she talking about? And why did she need that ring over his penis ? What kind of solution is there in the spray can ? Why did she says , "It's a very special sheath, isn't it? And now you see why you need the ring and the spray to keep you hard. It's like very coarse sandpaper inside, isn't it?" Its very Errotic that she causes the pain, but how does she cause the pain while fucking that guy? And what is coarse here ?? Please explain, thank you in advance.