Slavery: A series of erotic games (book 04)
She opened it and showed it to Wendy.
"These are butt plugs, used for lots of different purposes, but one of the primary purposes is to stretch you for anal sex. You start with the smallest one," she held it up, "which is about the size of Master's thumb, which you just experienced. We'll put it inside of your anus, and you have to wear it inside of you for a day. After one day with that one inside you, you graduate to the next largest size, this one." She held the second largest one up. "Wear it for one day, then do the same for each one of these until you've used the largest one for twenty-four hours. At which point, you should be ready for anal sex. Although if you don't have it immediate